What Causes Blurred Vision, Sensitivity To Light, Headache And Upset Stomach?

To introduce myself, I m 20 years old female. I ve blurred vision, sensitivity to light, car sickness everyday. I burp a lot, I have upset stomache and I feel that my body is full of gas and air. Air goes inside my body even through my skin. I can t eat because I feel full and I can t digest food. When I eat, I vomit the food. when I take a deep breath it makes me even vomit more. I have headache as a daily base, I experienced ALL types of headache. If I take panadol, i know i ll vomit it, so no use. even carbon bills makes me vomit. sometimes I ve Diarrhea and sometimes Constipation. what is my problem? and what to do to solve it?