I think the first step is to acknowledge that cancer changes a person's "normal". Cancer survivors usually have to find a new normal because it just isn't possible and often not desirable to return to a pre cancer normal. On top of that, in your husband's case, he also had multiple fractures. If he has had chemo and other treatments for his lymphoma, the ability of his bones to heal from those fractures is going to be much more difficult and take much longer. Cancer is a marathon, not a sprint.
I would suggest that you discuss his current condition with his doctors so that you have a realistic expectation given his condition. I would also ask for a referral to a social worker, case worker, or home health care company, or other resources that might be able to provide some caretaker respite.