Sometimes i almost pass out n feel really sick i found if i have a soda like dr pepper it makes me better what could be wrong with me?

See your physician: There are many reasons that may include diabetes, orthostatic hypotension, anemia, vasovagal response, bradycardia, etc. See your physician for a complete evaluation. http://www.nlm.nih.gov/medlineplus/fainting.html

Low blood sugar?: Two thoughts. First, and more likely, if the sugar is bringing you back then you may be experiencing low blood sugars, or hypoglycemia. Second, the caffeine in the soda could be bringing you around. I'd be concerned about the hypoglycemia, though. There is testing available for that.