| Always test before you workout and test after to help build an evidentiary profile.
Now based upon people describing their experiences, my sense of the matter is that for many when starting up an exercise program, maintaing control during and after the exercise is tough. I believe this to be caused by how changing from being primarily sedentary over to being regularly active results in both affecting metabolism and insulin sensitivity.
Perhaps changing over is best accomplished in gradual steps, if possible. Don't forget that due to your downtime, you won't get back immediately or even all that soon to 5 days a week 2 hours at a time.
I think you could try for something like 30 minutes a session and 3 times a week to start off and I'd suggest that you keep the intensity low. This will give you a way to start seeing how lower intensity and more aerobic activity affect you.
It's takes some time and diligence while you gather the data for what will be your individually unique profile, but worth it. | 
