I am sorry to hear of your circumstances. Your illness is not a defense or excuse for failure to perform the loan agreement. But, there could be technical defects in the loan documents or a failure by the creditor to follow the law on repossession. You should contact the legal aid organization in your county. You can find them through the local bar association if they are not listed under legal aid.
DISCLAIMER: This is not specific legal advice and does not establish an attorney/client relationship.