My son also broke his leg when he was 2. We probably carried him around the first week or two b/c he was scared of the pain/walking on the cast. Then one day, he wanted something so he got up and got it himself! We were also told 8 weeks but after a month his leg healed perfectly and the cast was off.
As far as entertaining, I kept him on a schedule where we did something every 30 mins (art, music, books, sign language, toys, go for walks), rotating different activities each day in different places in the house (latter may not work for you in your condition). It helped b/c he knew if he was in his bed, it was either story or music time, in our bed it was art and toys, on the floor by a window it he got to play with toys, and on the living room couch it was video time. I was able to keep TV watching to 1-2 hours a day as well.
We didn't have young children come over to play - the temptation to move too much and keep up was too great and our son just got upset when we wouldn't let him off the bed. But we did have several older children who stayed with him to play and read books so that helped as far as keeping his social life active.
Keep the house a little cooler than normal so you can help him minimalize itchiness. They also have a can of air with a long slim tube you can stick down a cast to relieve itching - similar to the air sprayers you use to clean keyboards. Try a medical supply store to find them if your regular store doesn't carry it.
Clothes - I put jumpers on him (the kind with snaps beneath) instead of shorts so we didn't have to slide anything up and down his legs all the time.
Push the fluids and fiber. He'll obviously be more sedentary and his system will need the extra "encouragement".
There WILL be crying, from pain and boredom (mostly boredom) and there might not be anyway around it. But keeping a schedule should help. Let me know if you want more specifics on the activities we did. Hang in there and let me know if I can be of more help.