I am the same age as you Jen and feel it too.....I am exhausted every day, it does not help that I am really anemic too. Just a thought, are you anemic as well? I know that it is hard enough to function with crappy lungs in itself, but add a depleted red blood cell count to it and you get that bone tired type of exhaustion that doesn't go away, even with rest. Might be worth checking into....
I remember when I used to run 3 miles without too many issues, this was all before my CF dx, I was only on inhalers for my "asthma" and antibiotics as needed for bronchitis but I was doing okay juggling a full time job as a nurse and a mom to two kids. Now, I am disabled and work hard to keep as healthy as possible, and am just tired too. When I have an infection, that fatigue is accentuated 100 times over (well, it seems that way)....
I also try to keep as active as possible even if it means walking the dog a block a day with my O2 tank cranked up when going uphill. It is hard to peel my sorry butt off of the sofa, but I do that for me as well as for my dog who looks forward to a quick jaunt in the neighborhood <img src="i/expressions/face-icon-small-smile.gif" border="0">
I have changed many of my activities to those that do not take up too much energy but are enjoyable such as crocheting, painting, drawing, reading etc.....I don't get too tired doing those things and it keeps my mind active. The finished products also make wonderful gifts at Christmastime lol.
Anyhow, I really do feel your frustration and my doc says the same thing, that it is the nature of CF. Last summer, I was active in my garden and felt great about growing my own food, this year, I could barely manage a herb garden for pete's sake! I have been on IV's 5 times this year and it seems like it doesn't take long before my lungs are junk again. Do you feel like tuneups don't clear you up as well as they used to? I feel that way, in the past, I would feel great after a clean out and feel that way for at least a few months. Now, even after 3 weeks of IV's, I feel better, but not great and my lungs don't feel "clean"....it's hard to explain that last one, but I used to feel squeaky clean even from the inside after a blast of IV's. These days, I still feel "sticky" and my color is right back to nasty after a few short weeks off IV's.
Rest when you can, your mind wants to do so much and your body is telling you to do otherwise. As hard as it is, listen to your body, I know it is hard when you have a husband and a house, but as I always say to my son whenever I feel like doing nothing, the dishes and laundry can wait until I am good and ready to do them <img src="i/expressions/face-icon-small-smile.gif" border="0">
I hope you feel better soon, sending hugs to you
Jenn 39 w/CF