Hi friend, I can relate your problem as one of the effects of malabsorption, increased body heat. try taking Calorie rich diet like plain Chocolates, Milk shakes, Icecreams (without dryfruits). Icecream n Milkshake to be taken immediately after dinner. To improve your digestion, absorption n assimilation take makkhan + sugar (equal proportion mixed thoroughly) half an hour after dinner followed by half cup of water. Do it for atleast 2 months you will feel the change.