I am a regular smoker and developed pain in my left side back. Doctor told me that acid has formed

I m a regular smoker  but before 5 or 6 months I have minute pain in my left side back and when it started I will stop smoking and went to doctor he told me to do endoscopy after that the report says that too much acid formed in my stomach and I ate medicine but nothing will help me when I stop medicine the pain vomiting and nausea felling . I smoke weed last day and all started again u tell me what I do