Hi
Not orthopods here so wrong people to ask for a medical question like that...but i would say that you could have healed without surgery but the shift in a week is pretty substantial so i would have listened to the guy too...
IMy rule is pretty simple - if you can stand on one foot and do a 1/4 squat, then you can drive - the thing is that you need to be able to work the brake in an emergency. I also get them to sit in a stationary car with the engine off and hit the brakes hard - if you can do it without pain, you are ok. If you have any doubts about how much it will hurt, you aren't ready!!
Of course, ask the drs about their opinion - they know much more than us, especially since we only have the information you have given us (which is VERY limited).
THanks