I had this discussion with my private insurance agent. You need to purchase US private health insurance that will cover you for emergencies globally. Mine does. I have Blue Cross, but there are others. Evacuation insurance gets you back home, a second policy. I have MedJet for emergency repatriation, but there are others.

You have a bad accident, you are in a foreign hospital, and you want a US policy that covers you for the emergency care and treatment to stabilize you. My Blue Cross does this for me. You probably want to have further hospitalization in the US, and emergency repatriation gets you back to the US. This is where my MedJet takes over. Once in a US hospital, your health policy takes over once more.

I see you have/had employer provided health insurance. Since you quit your job, you will have to join the rest of the US citizens who have no employer provided health insurance and buy it on your own. That's how it's done in the US. Have this discussion with your insurance agent for full details of how coverage works outside the US. It varies from policy to policy. If you are purchasing insurance through the exchange, make sure you have a local agent who you can add to you policy. You can also purchase health insurance outside the exchange, directly through an agent. For me, I want a local agent whose office is near by so I can sit in front of him/her and ask questions or have them fix problems for me. Health insurance and high quality medical care are not a right, they are commodities you purchase.