@mrshubka I know you said it happens with all foods but seriously, I was suddenly diagnosed at age 68 (!) with four main major food group allergies!! Wheat. Soy. Milk. And eggs!! It really sounds like an allergic reaction to "something ". Try cutting back one food group for a few days. See what happens. Not just for a day or two. You will notice one of a few things:
Nothing changes. There is a slight change (if so I would continue withholding what you stopped for a few more days.). There will be a major impact. But still continue through the food groups. I'm so bad (since tick borne disease Ehrlichia, being on leukemia meds which destroyed my immune system while I got the tick bite, and going on, then stopping completely, the lupus meds I was on which also affect the organs. I can't even eat something manufactured in a facility they also may process one of my allergens!!!
Or, it might be dust (inside or out) tree and/or grass pollen.
Curious question - does it happen when you're someplace else? A restaurant away from your house? A friends house? Work? Different seasons-even winter? Every single time you eat?
Maybe try an air cleaner. Or of course you can see an allergist and have "scratch tests" done to see if anything shows up there. I left that for last because my allergies were diagnosed through the blood that also diagnosed my lupus with lupus doctor. Allergy doctor refused to scratch test me saying my horrific hives were just a coincidence and that I had no allergies. When I told her the hives stopped immediately upon stopping those foods she told me it was a coincidence. I don't think so lol. I was angry she didn't take any tests. I hope I gave you enough to start with. I'm sure it's what others have told you but to test yourself, the Elimination diet seems to me to be the best. And I am currently finding some good options i.e. plant based foods to replace what I am allergic to. Good luck and let me know how you fare!!