Stomach problem. Pocket. plz help sir.

Dear sir, actually the problem was since last 4 to 5 days i was having stomachache, my faeces were black in colour and was  stomach was not clear properly and also having loose motion  today with black colour stool but on 25/05/2018 night I was feeling very pain also there was very much gas, irritation in my stomach and when at afternoon I observed that my faeces are dark, black in colour so immediately I had gone to a doctor and he gave me two injections, ORS, and other medicines tablets in the attachment and after having these medicines my stomach is cleaned but still today and yesterday my faeces are black in colour and I think today I was having loose motion and in that case also the faeces were black so, sir plZ help me and tell me some ayurvedic or any other medicines to get 100% fit and healthy and energetic without having any bad effect on my body as well as on my pocket. plZ help sir. Thank you.