If I exercise, will my insides fall out?

It's been nearly 4 months since I had my gastrectomy, 9 months since I had my baby, and a year since I've done any exercise.  Before the surgery and the baby I'd like to think I did  a lot of exercise.
Which included playing basketball and netball every week, karate (I have a black  belt in Kyokushin)  running and going to the gym.

I have been dying to play basketball since I had my insides chopped up, and since my stomach muscles have finally stopped hurting/burning/itching I decided it was time to get back on the court. I have to admit that the prospect of doing any form of physical activity was terrifying.

An actual regular size meal!

I think things have finally turned a corner for me! Last night I ate a regular size meal, about the size of what I was eating prior to my gastrectomy, and it didn't make me feel sick, or give me any other unpleasant side affects. The only thing I felt was a little bit full which was actually a nice sensation. I had silverbeet, carrots, home made fries and a small piece of steak. I thought that maybe this was some sort of fluke or freak accident so tonight I ate another large meal and it's been nearly two hours since I ate and I haven't had any side effects yet. HOW EXCITING! I really hope that this continues because I was starting to feel a little bit down in the dumps about everything. I would find myself lying around wondering if this was going to be my life from now on, constantly feeling nauseous and tired and not being able to eat what I want. So as I'm sure you can imagine actually being able to eat like a normal person has really cheered me up and I hope that things will only get better from here, it has only been three weeks after all. Oh and while I am talking about eating I know in my last post I said I'd let you know how the cheese burger went down and I've got to say that I really don't think that cheese burgers are the type of food that were intended to be chewed so thoroughly. By the time I had finishing chewing, it tasted so gross that I didn't even want to swallow it. I find the same thing happens with meat, you have to chew it up so much that it ends up tasting similar to what I'd expect cat food to taste like. Lucky I am not a big meat eater.