Few days ago, I did push-ups after so many months. Next day I had some domestic issue and felt butterflies in stomach (too strongly). Thereafter, I had weird feeling in my stomach. It wasn't pain or acidity, but very low intensity subtle pain in area above belly button and the entire night I kept feeling it and wasn't able to sleep. Then next day after waking up. It went away and in evening, it came back and felt as if muscle has been pulled in my stomach. I have no diarrhea no nausea feeling. The pain or swelling doesn't annoys for entire day.  Today I felt as if stomach is swollen. I sometimes feel acidity. But it's under control. I want to know what it is and what should I do?