The Other Day I Ate M&ms Plain Chocolate Once I

The other day I ate m&ms plain chocolate once I was done I became bloated and started to burp ugly. I tried to eat but I threw up the food. The next day I felt fine but after I ate dinner my stomach started to feel weird so I fell asleep. Once I awoke my stomach was bloated, i started to burp ugly again, and I had gas. This has been going on for a week now and it doesn't seem to go away I still have bloating, im still burping, and I still have to pass alot of gas. It doesnt seem to get better or worse when I eat different foods. What is going on with my stomach? Ive never experienced this before.