This maybe a little off-topic and an inappropriate forum to ask,but I am desperate for an answer.

I need advice to increase my Weight.

My Stats:

Height:5'6" Age:25 Weight:50Kg/110.231 Pounds

I wish to gain another 20Kgs.I am too skinny as of now.Really want to get fit.I have tried eating more than my usual food intake,but i suffer from indigestion whenever I do that.Looking for some helpful advice.