Also gaining weight

Good Morning.  I am a 3 year post op RNY.  For the past few months I have been craving and eating as though I had never had surgery.  Where did the satisfaction feeling go?  I tell myself that I should eat the proper way but then do not follow through.  I try protein shakes but they upset my intestines.  Fat is my enemy.  I wish sugar would also be.  I need help figuring out how to eat and how to stay on track.   Sheila