<s>[INST] Sharp stabbing pain in lower left side of stomach , happened very suddenly and felt like I might pass out, also hurt to breathe, stomach and chest felt tight, like i could not take a deep breathe, it lasted about 20 mins, I had to sit down because of the pain but then it just went away as quickly as it came, still don t feel well but the extreme sharp pain is gone, very confused about what this is, what caused it and why it came and left so suddenly [/INST] Hi, Thanks for posting your query. Do you have fever/ watery diarrhea/ constipation/ spasmodic abdominal pain/ nausea or vomiting/ weight loss/ mucus discharge in stools? Do you have any mass palpable in abdomen? Is there any aggravating or relieving factor for abdominal pain? With the available described symptoms, there could b possibility of peritonitis or muscular ache. You should consult with internal medicine specialist/ gastroenterologist and should go for thorough check up. You should go for complete blood count, urine routine microscopy, renal function test, serum amylase and lipase, colonoscopy, UGI endoscopy for better clarification. You should take low fat, spicy soft diet. Meanwhile, you should take antispasmodics along with proton pump inhibitors. Treatment depends on exact diagnosis. Take care, </s>