I am suffering severly from bloating, acidity and gastric problems what do i do?

I don't eat junk food and also don't eat spicy food. Sometimes i feel no pain and feel great and sometimes i feel uncomfortable and my stomach feels heavy. I have been taking MYLAN-PENTOPRAZOLE 40 mg but its not helping. I go to the gym 3 times a week and also do yoga. In addition i also drink lots of water 30 minutes before before drinking tea. This has been going on for 3 months. Please help!!!!!!