I did my first challenge today after elimination phase. to be honest, I wasn't planning the challenge like this, it was more a cheat, but shhhhhhh, okay?

Food contained wheat. I thought it was fine, but nope, I'm having MCAS reaction to it, even with taking my antihistamines. Reaction is weak, gets worse when my antihistamine dose is wearing off. I'm on my rx antihistamine for overnight, so hopefully this will be over by morning?
stomachache, nausea. later, indigestion. (eww)
starting later, dermatographism, flushing, itching and burning skin in places. And of course it I touch the itchy spots, then I get the dermatographism or flushing reaction which itches more.
Naughty little mast cells!
I did an unplanned dairy challenge yesterday. Not aware of a reaction, but I went to bed pretty much right away after eating. My doctor said if I react to a food to wait 3 days before the next challenge. She also said to recheck foods I'm reacting to every 3 months. Because these aren't food allergies, it's mast cell activation. So triggers may change over time and checking periodically prevents overly-restricted diet. IDK, I'm pretty well convinced I don't need to be eating wheat, ever.