Left side chest pain. Is heart related.

I am 29 year old over weight. suffering with anxiety from one year used medicines etizolem Propronolol and nexito forte and recently stopped using them I also have gastric and using rebari dsr.while suffering with anxiety i used to have heart paltipulations after using etizolem I was fine. Now after I stopped using medicine few days i was fine but later recently I am having left side chest pain very frequently when I am having chest pain I was feeling very stress and worries. Last year I had ecg and doc said everything is fine. I consulted my doc about this pain and he said it is not heart related don't worry. I even consulted gastric doc and she said it is because of gastric and also because of anxiett and asked me to continue nexito. When I have this pain and sometimes I have burps I feel that it is because of gas. But sometimes it comes without burps sharp pain while sleeping or sitting no matter what I do it comes suddenly and I start to worry and think it is heart related..