Okay, lots of questions for you:
Is the local hospice or Macmillan service involved?
Have they checked that he is getting all the correct benefits? People who have less than a year to live are sometimes entitled to extra money from the government
Has anyone helped you to look at whether you can get carers allowance?
Has the local council and health service started assessing his care needs yet? He may need equipment, a special bed, or home care assistants who can help with dressing, bathing, etc. District nursing team may also need to be involved at some point.
Have you and he ever talked about the end? Would he prefer to go into a hospice or does he want to stay at home if possible?