I am 5 3 and have been weighing around 99 pounds. I eat 5 small meals a day egg whites, grilled chicken, broccoli slaw as a salad, some chocolate. (a small handful of semi sweet choc chips) a couple bites of fruit, a lot of light cool whip. For lunch I have a pure protein shake. Organic peanut butter is on if my afternoon snacks. I also snack on almonds and pork skins. I m the last 2-3 months I have notice my lower abdomin bulging like I have a pregnancy pooch. I do P90x and run at least 6 days a week. After I am done eating I may throw up some of what I have eaten. Sometimes it s just foam. I am burping like heartburn???? My abs have been very flat for the past 3 years. Are these signs of a serious medical condition or just experiencing weight gain?