From what I know (I'm no expert) you can have a low CRP level and still have inflammation. If it were as simple as taking a CRP test for for identifying inflammation, doctors would have patients take that test BEFORE prescribing potentially harmful prednisone which is used to reduce inflamation. They would do this test first before of testing for allergies. But they don't, because I don't think they think it's definitive. However, my curiosity about CRP levels has now been peaked and I will ask my doctor why this test, like a sed rate cannot be used definitively to measure inflamation.
And even if CRPlevels were high, none of them can tell where specific inflamation is -- you could have something like ginigivitis and it would come up high. So high numbers may not help much in the test either. I know there is still some controversy on how to use CPR levels because the test is still fairly new.
And as far as allergies affecting you, especially since you notice more nasal drainage at home, it is a possiblity that you have them. There are so many many things that can be affecting you, not just a few things. And even if you were able to identify them, and addresss them, you are not going to see an instant change overnight. Unfortunately it can be a slow process.
CRP is only one marker of inflammation and is most helpful in predicting heart problems as well as being used to help identify acute inflamation as well as a few other uses.
I do hope that you figure out what is making you feel ill and that you start feeling better.
