I am nearly 1 year post op and I had a rough surgery and was in ICU for 2 weeks. I remember not even being able to take one step without throwing up. When i got home, I just sat on the couch, eating ice pops and sleeping all day. Within weeks, I slowly made my way to the treadmill and forced myself to go 1 minute, then next day, maybe 2, with supervision, of couse. Slowely, i just increased my time and then ventured out doors. Within 5 months, I was back at the gym. Again, very slowly. I made my way back to step class, basic at first and now up to advanced and I have been body pumping ( weight lifting) and can jog/walk combo for 5 miles. I, too, love to eat and have gained 25-30 pounds since this nightmare began. But I don't stress about it as much. i just love that I can still exercise so intensly like i once did. I may not have my face back, and my eye hurts and won't blink but at least i can be active. It was so hard, at first. i remember sitting on the couch, planning for like hours, how I was going to get up and pee and grab another ice pop from the freezer (that's all i could eat). Then after that feat was completed, I would sleep for like 2 hours. I was home alone. I have come a long way.
So, anyway, my advice is to start out slowely, and yes, you can hopefully regain your level of exercising, over time. I wish you the best.