What about other kinds of insurance?
Beyond health insurance, do you have private disability insurance? In addition, depending on where you live and where you work, you may be eligible for state disability insurance, which covers a limited period. This can help with some of your bills.
If you have a life insurance policy and you need money to pay for your treatment or your bills in general because of lost income, there are ways to sell your policy.
Whether or not your employer pays you for sick leave, or whether your mesothelioma is considered a work-related illness is a very complicated question which will be addressed in a different area of this website.