Welcome to HCM
We understand your concerns
I went through your problem description. You had food poison and was under such a condition two weeks before. Now again you are having sulpher taste in you mouth. Well. Burping is due to gas and gas develops inside your stomach often. This gas alongwith food materials sometimes rises up resulting in burping. If your evacuation and digestion is not healthy, the food materials starts decaying inside your body and start producing biogas which is smelly and this can sometimes go up also.
You are just 23 and please do not dwell deep into health or else you shall destressed and might come up with OCD
. If you are in doubt, talk to a physician nearby.
Hope this answers your query. Available for further clarifications.