The burping is probably fine, part of the nausea. The loose stool and nausea for 6 days seems a bit long. I'd go to a doctor might need meds or something if bacterial. Not a doctor, just think 6 days is a bit long for a viral bug.
i have had the same thing for the past week also. i just got up one morning and after eating the same breakfast i always do, i felt terrible. same feeling of something just sitting in my gut, and nausea. actually same symptoms as you exactly. i went to the doc and am going for a gastroscopy and colonoscopy soon to see what the problem is. dr thinks it may be an ulcer, so i am on zantac, and that has helped a bit, but got nausea again tonight after eating a relatively small meal of boiled rice. like you i am over it already and really want answers. i will post here again once my tests are done. i have a history of anxiety, so wondering how much is panic related?
good luck finding answers for yourself, its painful and worrying huh!?