Celiac, Gluten Sensitivity or Lyme?

So my symptoms started randomly, got a huge wave of "brain fog" one day, honestly feels like yeast in my brain... headaches and what have you. So I honestly need to calm myself down because I keep thinking I have some deadly disease and sometimes it depresses me and gives me anxiety to just keep thinking about this, I don't want to have to worry anymore and just live with it.

So I realized that keeping away from gluten alleviates most if not all of my symptoms of "brain fog" and terrible moods. I don't have joint pain, only some minor pains when I have offending foods. I don't have stomach or intestinal pain at all, or if it is there it is very minimal. My symptoms mostly reside in my brain.

I have to stay away from mainly corn and gluten, and bananas also bother me. I can eat certain candies fine, like reeses and starburst but some reason skittles bother me if I have too many (maybe the dextrin?). I can't tolerate alcohol at all, if I have one beer or one shot within 15 minutes I instantly get into a bad mood, so I cannot drink whatsoever. Literally feels like an allergic reaction in my brain. Again, I have no stomach pains.

I just wanted to know what are the chances that this is lyme, celiac, or gluten sensitivity? I was tested for lyme probably 3 times within the past 8 or so years and all came back negative. Never had the igenex test though. I've also had a brain MRA, not an mri, and it came back normal. I wonder what an mri would show though.

Thanks for the reply. Your right in that it doesn't sound like Lyme... Unless I got some neuro strain or something but I doubt it. I'm leaning more towards food sensitivity. Thanks for the second opinion.