Stephanie,
So sorry to hear this new development. As if you guys did not have enough on your plate.
Good news is he will probably be eligible for COBRA. I had to use it in the past, and it is ok. Downside is that you will now also have to pay the part of his health insurance that his company used to pay, but that's better than having no insurance. There is also an added 2% admin fee.
Here are the details. Know you are overwhelmed, but it's critical that you keep him on his insurance if possible.
https://www.cms.gov/cciio/programs-and-initiatives/other-insurance-protections/cobra_fact_sheetRobert