I'm no professional, but weren't you referred to physical therapy to recover from this? That's what they do, rehabilitate you and tell you when you're ready to do what you want to do.
Sorry you had to go through all of it. Wishing you a speedy recovery. I think you should consult a specialist who can assess you condition better. Vising a nutritionist will also be helpful in weight loss.
What has your surgeon said about what to avoid or limit to exercise?
I suggest looking into the paleo diet. As for cardio with the OK from your doctor you can do both or either one of the following.
You can easily get back to your weight with healthy diet. You can consult your Physiotherapist to suggest best exercise for you.
I would only say in response to Gymdandee that my experience with surgeons is that the only thing they really know anything about is how to maximize their income. If you're lucky, they correctly diagnose you and correctly perform the surgery, but again, that's just luck. But what they really don't know much about is rehabilitation -- that's what physical therapists specialize in. I just had surgery, and I believe my surgeon gave me the approval to go ahead with my normal activities much too soon, and I might have suffered permanent damage because of it. Surgeons are cutters, that's what they like, the adrenaline rush, but the rest of it they don't care for as much usually. Physical therapists will actually move the body point and measure how far you can move it and so when you get surgery for an injured body part surgeons usually refer you to a physical therapist who helps you get back to where you want to get to if you can. That's why I asked if your surgeon referred you to one, since that's usually how it goes.
And by the way, doing physical therapy is pretty grueling, so it's a workout in and of itself. The work slowly at first, but keep adding on -- the main problem with them is they often discharge you with a permanent PT routine that can take over your whole workout, but at least you're moving again.