I would worry less about the money, things usually work out. You also need to identify all of your options. Does your partner now qualify for SSI, disability and/or Medicaid? If they do get Medicaid. Otherwise the Affordable Care Act will limit your/their financial exposure as well.

Next, you need to build a support system of friends and possibly family (if they can come over for a time to help).

https://www.usa.gov/disability-caregiver

Some states have better options than others, especially for caregiving. You want to look into personal care assistants. It can be very difficult to find people but