This is very interesting thread, can relate to a lot. I took the alcat test a few years ago and it made me aware that garlic and eggs made me feel worse. I already knew about gluten being a negative for me, and dairy too altho I love yogurt and went back on dairy after 6 month abstinence back then.
I use benadryl for sleep half of the time and a little claritin as came to conclusion that lowering histamine good for me; historically I wasn't an obviously allergic person, never had problem with animals or hay fever as a kid so I was surprised that a little bit of antihistamine can help some cfs symptoms. Thats said I usually buy the kids syrup of these things and take like a 1/4 of teaspoon and work up from there, when I first started benadryl 5 years ago I could only take a dot of the syrup, like 1/100 of a dose as it knocked me out, the MCS, I am sure a doc would never believe that but whatever. I developed some tolerance slowly over the years but still if I take a full dose I get terrible diplopia the next day and grumpy. I took 1/2 tsp of kid's claritin syrup last nite,I usually only take a dab of that stuff but was experimenting to see if helped sleep like benadryl, and today I have blurry vision pretty bad...very bizarre. Its also partly due to taking a shower and washing hair, sometimes I get blurry vision next day so don't wash hair a lot.....weird development last 5 years. Could be toxins in the water or physically messing with head that triggers it, not sure.
In early 90s when first started dealing with neruo probs tricyclics were rec'd for pain and I could only take minute amount few times a week like of doxepin and I noticed it made me less MCS but it made my heart race and worsened my sleep so had to go off after a year. The MCS really messes up trying meds/supplements. I am curious to try this histame but wonder about the reports of headaches, N-AC gave me killer headaches for example. And Zantac group of blockers messes up my breatheing, pulmonary stuff.