Just buy health care. Since you have no income you qualify for subsidies under ACA/Obamacare (but even without those subsidies the plans available are much better than the ones before the law passed).

The ACA is one of the most entrepreneur-friendly laws passed in my lifetime. Big businesses don't like it because health care is one way to retain employees, and so the lobbyists screwed it up a bit for medium businesses. But while starting, it's a lifeline.

COBRA from your previous employer is probably more expensive.