I'm so sorry! This is a really trying time--and maybe a liilte emotional too--you and your poor liitle one!
I think asking for help from someone is a really a good idea--neighbor, freind, church somebody--even if you aren't at a church, call a nearby church and tell them what's gong on--people will want to serve you, in some way. Have husband pick up healthy meals, so you are taken care of too.--Entertaining the little guy is hard. Maybe read to him--Boynton books are good. Stacking things. We also play with rice and cups. We put rice in a large tupperware and he dumps and plays with cups and measuring sppons--and I've learned to put nespaper in the surrounding area fow quick clean up--because it is a huge mess. Dry beans also works.
You can make homemade playdough too--recipes on-line and maybe he can make things with that--use cookie cutters--if you can get in the car late afternoon, you can go look at Christmas lights--visit different neighborhoods each day--you may not want to go out due to your condition, but malls and museums have two-seater wagons and he could stretch out while you stretch your legs--or you can put him in a shopping cart at Target or Meijer or Walmart--sometimes we can spend the whole day there because they have fish tanks, a snack bar, movies playing on screens, and an entire "library" for my kids to look through (and I don't have to buy anything, generally, because I tell my boys that the store is letting us borrow the book for the trip and we need to give it back at the end--but meanwhile, they get to look at something we don't have at home--and I have been doing this with my almost 3 year old since he was 18 months--it works .) Just going for a drive--fo a change of scenerey, may do you both well ( again, I don't know how well he travles with a broken leg or how you have to prop him up)--and last but not least, he can bang on pots and pans while you play music ( or you can get some cheap instrumetns at the dollar store).--I really feel for you and this time. Hope the suggestion help.