My UC prevented me from working out or doing anything strenuous, I could barely lift my son from his crib.
So. When I nixed the UC I could not wait to start working out and lose all this weight that has accumulated. It's not cool. Anyway, I started a pump class and working out as much as possible two months or so after my surgery. It really wasn't a good idea. My stoma site and abdominal area began hurting super bad.
Maybe you could start with a much lighter weight than normal, and build your cardio with an exercise bike or elipitical? I understand your need to get back into your routine, so please do it with caution. You'll be back up and bulked up in no time!