Julie,
It's a really tough surgery and takes a while to recover. Being tired is pretty normal. Naps and walking around the house are the best. No driving if you are pain meds. I don't remember how long it was for me after before I drove. I started walking a little bit outside each day after a couple/few days home.
The doctor can tell you how long before you should attempt driving but you would be better to have someone drive you for a bit. You will notice bumps in the road that you never realized were there before!
Glad the bowels are under control! That's a big deal, isn't it?
Much bigger deal that one realizes until after a surgery like this.
All the best for continued recovery. Keep up those short walks.
Mike
PS: If you are REALLY tired, you may want to take your temperature. Infections aren't unheard of so keep an eye on that.