<s>[INST] hi. i'm not sure why my stomach all the sudden started to hurt.. but i woke up with the worst stomach pain right in my stomach. at first i thought it was gas, so i went to the bathroom... only to find that my stool was completly black... i have not felt like this before... i feel like i have to throw up, but my body won't.. please help [/INST] HiThanks for posting query on Healthcare MagicYour symptoms indicate possibility of acid peptic disease that may result in to peptic ulcer. That could be causing pain. Sometime blood vessel this ulcer erodes nearby blood vessels and causes bleeding in stomach or duodenum give black color to stool.Consult doctor he will give you medication (pantoprazole or omeprazole) investigate (Hemoglobin, CBC, Stool for occult blood) and if necessary endoscopy.Hope this answers your query. If you have additional questions or follow up queries then please do not hesitate in writing to us. I will be happy to answer your queries.Dr Jeetendra SharmaSenior Consultant Critical care Medicine. </s>