I've gained 20lbs in 3mths I have a very swollen stomach. Pain. Worse with touch extreme gas (both ends) loss of appetite. Nausia.

See below. Problems like these can only be correctly handled by your doctor in person. He/she needs to listen to you, perform an examination and possibly run labs or other tests. That's the only way he/she can find out what's going on and what to do about it.