Just remember, your body has been through a huge amount over recent months, let alone the emotional impact of a cancer diagnosis and treatment. You don't mention radiotherapy, so I'm guessing you didn't have that, but if you did, that can also cause fatigue. I was told at the beginningthat it would take at least as long as treatment lasted to recover from it.
I'm going to use a phrase that I loathe, but it fits the bill here..... be kind to yourself.
I can't answerthe financial side of your question, though.
Take care