<s>[INST] Hi Yesterday, I had a really bad stomach ache after I ate dinner.. Then I felt like I wanted to throw up, so I just crouched down and held my stomach to help lessen the pain. When I got up, everything became dark and black.... And all the sounds around me became muffled. :( since it was loud at the restaurant, I stepped outside.. When I got outside, my vision and hearing got better.. I also pooped when I got back to my apartment. After I was done, my stomach was okay again. Then this morning, I started to have cramps which turned into a stomach ache. What's wrong with me?I'm 20 years old, female, and healthy. [/INST] Hi ! Probably you had a food poisoning with your dinner. This gives rise to vomiting and abdominal cramps associated with loose motions. The act of vomiting causes a valsalva manoever which results in muffled or imparined hearing in your ear. Post vomiting when you got up suddenly, the blood circulation could not cope with the sudden change in posture and due to vaso-dilatation, blood supply to brain  became less which resulted in a transient black out. You should start taking some appropriate antibiotic on consultation with your family physician and properly hydrate yourself in case you start getting loose stools. Take care. </s>