don't want to bring you down too much but 6 might be a bit optimistic. for very smooth stuff i would have been ok at 6 weeks, but i REALLY didn't want to land on it again, which is a sentiment i'm sure you understand right now. turbo at 5-6 weeks, then gentle off-road at 8 IIRC.
try and keep your pit ventilated.
don't confine it to the sling all the time ( much easier this if they've given you one of the velcro sling things ).
DO THE EXERCISES.
get additional physio if you can - you can usually ring them or ask to see them a few weeks after your initial visit to them. i found that worth it for my mental well-being, for reassurance, as much as anything else.
take a memory stick in and get your xrays.
otherwise, bad luck. it's going to hurt like bu66ery every now and then. one particularly vivid memory i have is when i was in the bath, about week 4, i had a pain like someone had just stabbed me with a knitting needle. shaky, sweating, thought i was going to black out, or puke, or both. it was alright though and that was just a one-off.
hope you get better quickly. look on it as an opportunity to surf the web, watch 5hite telly, and catch up on a few films and books.
all the best and keep your chin up. the majority go back together just fine.