Stef i see you are keen to get going. I would suggest wait till you've seen your surgeon as he has specialist knowledge of exactly what your body has gone through, whereas your gp is very much more generalised knowledge or as i found out with my new gp little or no clue.
If you really can't wait then i'd suggest maybe just go in and use the treadmill, nothing strenuous, and use the time to get to know other members who can be a source of support to you on your journey.
Best of luck sweets, keep us posted.
ps, please fill in some of your profile as it's good if we can see what surgery you had and when, especially if you want advice xx