On my way to the GI doc, can't write a novel, but:

I get it. *hugs*

There are other ways to do this than detailed food logging. If you are concerned that something is making you ill, try not eating it for a few days, then make a note of any symptoms you experience when you eat it. This is what I did when I wasn't sure if there was a problem with gluten and needed to convince the doc to test.