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.
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 Valhalla maneuver which results in muffled or imagined 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 vasodilation, 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 HY Chat Doctor.  Take care.