I belch a lot these days specially after food since 4 days .. now i have diarrhea what it could be from btw belching like 3times/5 to 10 mins thanks?

Gastric reflux: You are probably having reflux(backing up) of stomach acid into your food pipe(esophagus) which is causing the belching. It is happening right after eating because stomach acid production starts with food entering the stomach. You need to try medications like Maalox, Mylanta, Pepcid (famotidine) AC, Prilosec OTC which can help symptoms. You also need to stay upright at least 45 minutes after eating.