I'm so sorry about your fall! Oh the crutches. They are awful. I have LOTS of experience with them LOL.

After a while, you do build up calluses on your hands and then it doesn't hurt your hands very much.
Are you allowed to put any weight on your leg? If you can, the rollator sounds like a great idea.
If your balance is crappy, be really careful with the crutches! Especially when trying to use just one crutch. I have fallen from using crutches before I was diagnosed. Icing on the cake when your already messed up

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Hope you feel better soon!