Hmart

Thank you so much for the responses. Every piece of information helps. 
I only knowingly ate gluten once, that was four days ago. I had the reaction about 3-4 hours after consuming it. I’m concerned that after 4 days the symptoms aren’t abating and almost seem worse today than yesterday. 
I haven’t had either breath test. I did ask about additional testing but the PA recommended me to a celiac specialist. Unfortunately the first available is mid-December. 
As far as diet, I am a pescatarian (have been for 25+ years) and I stopped eating dairy mid-last week as my stomach discomfort continued. Right now, I’m having trouble eating anything. Have mostly been focused on bananas, grapes, nut butters, DF yogurt, eggs, veggie broth.  
I ordered some gluten-free meal replacements to help. 
But I’ll get all the items (thank goodness for Instacart) and try the diet you recommended to get me past this period of feeling completely awful. 

Yes, my doctor diagnosed celiac. I was concerned it wasn’t right based on the negative blood test and my continued symptoms. 

Even if you are ‘glutened’ it shouldn’t last forever, right? Is four days too long? 
 

I was not taking any medications previous to this. I was a healthy 49 yo with some mild stomach discomfort. I noticed the onset of tinnitus earlier this year and I had Covid at the end of June. My first ‘flare-up’ with these symptoms was in August and I was eating gluten like normal. I had another flare-up in September and then got an upper endo at the end of September that showed possible celiac. My blood test came a week later. While I didn’t stop eating gluten before I had the blood test, I had cut back on food and gluten both. I had a flare-up with this symptoms after one week of gluten free but wasn’t being crazy careful. Then I had another flare-up this week. I think it might have been caused by Trader Joe’s baked tofu which I didn’t realize had wheat. But I don’t know if these flare-ups are caused by gluten or if there’s something else going on. I am food journaling and tracking all symptoms. I have lost 7 pounds in the last 10 days. 

The symptoms that led to my diagnosis were stomach pain, diarrhea, nausea, body/nerve tingling and burning and chills. It went away after about four days but led me to a gastro who did an upper endo and found I had marsh 3b. I did the blood test for celiac and it came back negative. 
I have gone gluten free. In week 1 I had a flare-up that was similar to my original symptoms. I got more careful/serious. Now at the end of week 2 I had another flare-up. These symptoms seem to get more intense. My questions: 

1. How do I know if I have celiac and not something else?

2. Are these symptoms what others experience from gluten? 

When I have a flare-up it’s completely debilitating. Can’t sleep, can’t eat, can’t move. Body just shakes. I have lost 10 pounds since going gluten free in the last two weeks.