I have gained weight in just 18 days due to the fact that I ate like a freakin bird when I was using. Now I am eating healthy and also exercising but still gaining weight. Was 160 when i was using, now 172.
My situation is different, because I lost weight when I stopped using the pills. I did a lot of research on the Percocet I was taking, and a lot of the websites I read on stated that they actual retain [and keep] water weight on you when you're on them, as most opiates do at times. I've been sober for 70 days from the pills, and I have lost a little under 25 pounds to date, which I'm grateful for. Your body might be so used to NOT being in so much pain while you were on the pills, so being in pain can cause you to sit more and not do as much - this is a possibility - but I'm definately not a doctor or anything, you know?