I am sorry to hear of your issue with DIOS, or Distal Intestinal Obstruction Syndrome. It is common in CF, however, its popularity in no way diminishes the deadly seriousness DIOS presents. The meeting point of the large and small bowels is the distal-distal junction, so named because they are the furthest end from the openings at either end of the oral process, our gut, from the teeth on.
DIOS occuring at the distal end of the large intestine may be a continuation of something that just moved from the small bowel. Both the large and small bowel are pretty smooth and easy to move through. The transition from small to large is a link called the iliocecal valve.
The iliocecal valve isn't a valve as such, the small bowel attaches to the large bowel at right angles, a few centimeters, from the actual end of the large bowel. Food/poop must move past the junction, it's meant to slow things up so the large bowel can squeeze it and begin to reabsorb water and the continued digestive action from probiotics. Too much delay in continued processing and too much water is taken up, and you have a hard stool in a less than perfect location. This is a typical start to what can be a bowel blockage. A hard blockage isn't typical of DIOS, but it can occur, and be very dangerous. They're hard to miss, the pain rivals the worst pain, compared to giving birth or passing a kidney stone. Don't waste time wondering if your excruciating pain is just gas. A little embarrassment at the ED is worth it compared to the surgical removal of a blockage along with however much intestine has died from strangulation. Being fixed good as new is possible but time is inches of necrotic or dying intestine. Ask anybody with an exteriorized stoma, it is not fun.
DIOS is a form of constipation. From my experience, DIOS is soft, adhesive, voluminous and redefines smelly. To understand DIOS, I started with the end game, acquired megacolon. The large bowel becomes stretched out and flaccid, the inability to contract. The worthless colon may have to be removed. Too much enzyme supplement can damage the nerves of the intestines, usually the large colon, this too can result acquired megacolon, no nerves to sense the fecal matter and nothing to signal the bowel muscles to contract.
With supervision from your doctor, and the fact that most of us pay dearly overestimating the amount of enzymes taken with a meal, it's unlikely to be the cause. Overuse is serious as is underuse of enzymes. I've been on way too little, too little and like most of us taking enzymes, too much. Way too little, combined with a habit of dehydration, I had hard, dry stools. Too little enzymes and I was actually increasing my fecal volume. The poorly digested food won't be absorbed by the intestines and every microbe in the gut is having a field day. And they produce gas. Something about maldigested food creates an adhesive that can break down the normal mucus lining and attach to the intestine, large or small. Fecal adhesion makes moving a stool material nearly impossible. This has to be addressed to have any expectation of a normal bowel.
What is needed is a sense of dense weight or a force "poking" at the intestinal walls. A bowel full of light, pliant and adhesive stool can go unnoticed by the body's autonomic system. This is a miserable condition and is not easy to resolve. If your stools are anything like I describe, my best advice would be to have your doctor increase your enzymes supplement. To get a handle on my own issues, I more than doubled the amount, it was that far off. Once my enzymes were dialed in, my stools were half the volume and the other issues went largely away. It's not that easy for some people, I am forever chasing after a normal gut.
For a belly that won't settle down, routine helps many people. Any good home medical guide suggests habits that promotes regularity, stopping at laxatives and suggesting that we see our doctor. Many CFers use Miralax. It can give you that dense weight that stimulates the gut. Until last year, my trick was a mocha. Much more tasty than Miralax and the stimulant effect works. Now it works too well, herbal tea for me until whatever is causing my gut to overreact to coffee.
Often nothing seems to work. For all the caution over stimulant laxatives, 8 years ago now, my doctor told me that I might not have a choice but to use a stimulant laxative for the long term. Now I understand why the grocery stores sell bisacodyl sodium in bottles of 200. I know most fiber bulking agents and regiments and use natural fiber in conjunction with the 5mg orange pill.
When I was wondering if I was going to die from constipation or suffocate because my diaphragm was pushed up from the DIOS, someone on this site suggested a tablespoon of mineral oil. Unlike the oils associated with history of "a dose of castor bean oil" mineral oil is simply indigestible. It coats the intestines and will eventually allow a stool to slide out like a well oiled machine. Things like diarrhea or a "surprise" are very unlikely with mineral oil. A teaspoon to a couple of table spoons is my practical dose range. Never start out with more than a tablespoon with an adult. This is a poor answer to an adhesive stool, but it is recommended for easing a soft blockage of DIOS.
Stimulant laxatives are OFF the list if there's a real chance of a hard blockage. I've been pretty blocked up and been "prescribed" a bottle of Magnesium Citrate, a single dose treatment in a bottle. It is Over The Counter (OTC). This is not a gentle laxative, it is safe when used as directed. If a hard blockage is suspected, a call to the doctor would be in order.
For me, the battle comes down to a properly adjusted enzyme supplement like Creon or ZenPep. It took a while to get past the huge numbers like 24,000 IU or even 36,000 IU but they are just numbers, results speak volumes.
I hope this very long and very late post is helpful.
LL