Upper GI problem. Is highly appreciated.

Hello all, I have lots of burping and gas release. My stomach gets bloated as soon as I eat otherwise it's filled with lots of gas. The area where the rib cage meets and the chest is always tight and feels like its full of pressure, also my left side and neck are tight Its making me extremely fatigued all day and pain in the upper thoracic area. My doctor suggested Gonaton total once and actapro thrice a day for 15 days. My question is My first night on medication was horrible. I had severe nightmares and anxiety along with lots of uncomfort near the rib cage area. I woke up and was afraid to go back to sleep, It was like I was fading away and don't know what the reality is. I saw that Gonaton is not FDA approved in US and UK but is used widely in Asian countries and there's no enough drug interaction data for this medicine.(I'm on Daxid 150mg for the last one year) Kindly let me know if I am on the right path to curing whatever the problem I'm having. Response is highly appreciated.