Feel of Vomiting and Gas. Amplified?

13years ago I was diagnosed with stomach infection which the doctors cured by injections through the channel (I am not much aware about it). During that time I was cured, but some problem existed where even after eating normal food I used to feel like vomiting and stomach ache everyday almost even just for 5minutes but I used to feel. 1 year ago, I had my sonography done, report was normal and also did my stole test and report was normal but the problem existed still. When I am stressed the stomach pain out of no where starts. In the mid of this, 1 month ago I was detected with PCOD condition and I am eating those medicines as written in my profile and early 20days of starting were fine. But since last 5days I am feeling to vomit but it isn't happening and I am uncomfortable 24 hrs. I don't know why its happening (I haven't shown any gastro yet for my prob) I think maybe due to my underlying problem the side effect of the medicine is getting amplified? Pls guide, whom to consult. Help.