You should not be losing weight unless you have changed something in your workout or diet, period. However, if you have a super metabolism, eat like a freaking pig, period. Then supplement 2 or 3 protien shakes in a day and lift, you will grow.
Go to a liposuction center and ask for the suctioned fat to be transplanted to you. Anyway, I was like you when I was in the philippines, I just kept dropping weight and couldn't gain it back, looked like a stick figure @ 120-130. Anyway, something about the diet here in the US keeps my weight stable at 150-165(I fluctuate at that range), too bad I already have stretch marks for those times I lost weight rapidly Anyway, work out, take weight gainers or protein shakes 2-3x daily and don't eat too much, eat at intervals and just make sure something is in your stomach. Being too full increases abdominal pressure, could be bad.
Focus on 6-8 meals a day. Each meal should have 2-3 servings of vegetables, 1-2 servings of meat, and maybe a grain or dairy product. Drink 4L of water per day.
