I am 2.5 years out a...

I am 2.5 years out and have just recently started gaining some weight. I have not been doing anything that I am not supposed to be doing other than not exercising. I work from 7:30 am until 4:00 pm and then school from 5:00pm until 10:00pm. Come home and do my wife and mother duties. Is it becasue I am sitting on my butt more than normal. Is there a revision surgery out there? I am getting really scared. I need help. Is there help out there? Has anyone else had this same problem?