2 weeks ago,I've taken an antibiotic called penicillin amoxicillin to treat strep throat. After awhile,I've recovered and started feeling better. However I've been burping frequently and my stomach's making weird noises. I went to the doctor,and he said it was an after-effect of amoxicillin. So I started taking Tums and Zantac 75,however after a few days,the symptoms did not improve,so I started taking Gas X due to too much gas in my body,but after two days,I still felt uneasy. My symptoms usually gets worse when I sit,my body starts aching,my chest,body,and head starts feeling heavy,and I seem to have excess saliva in my mouth,and I seem to have the strong urges to burp a lot,aside from that,when I swallow,I could feel the saliva going down my throat,I've also developed minor headaches,and a cough. Also I've been having anxietys of heart attacks,strokes,cancer,and illness. Is this is a serious mental and physical problem,and what can I do to relive it.
Usually the symptoms are less severe when I'm outside.