Chest tightness due to Gas. My answer,

I am observing chest tightness due to gas after dinner and it's taking much time to settle down and it's happening after I got covid. Recently for neck and hand pain i am using TOLPERITAS D AND PREGABID tablets so after using TOLPERITAS D from 2 days it happened so today i consulted general doctor and advised to take ECG and it came normal. Even few months back due to benefit of doubt i have taken ECG D ECHO TMT and all were very normal so doctors ruled out heart problem but sometimes when chest tightness happens am feeling slight pain around chest and post nasal is getting blocked for sometime so can i confirm this is definitely gastric problem and need to use medicine for gastric only if so what's the best advise I can get and suggest me best treatment for this because am suffering with this from last 2 years. Hoping I will get my answer, Thanks