There is short term insurance available for purchase online in the US. As with travel insurance it is often very limited cover .. catastrophic events only, no routine medical appts, no cover for preexisting conditions, no medication etc .. but its better than nothing in case of accident etc. Google “ short term medical insurance USA. Bring a good supply of medication in original packing and make a call to the ACA navigator team in your state the day after you arrive. Get SSN asap and back accounts etc as you will need evidence of residential address for many things. If it feels like a never ending spiral
into a dark hole .. that’s exactly what it is. But you will get there. Use the time before you arrive to get a ls much info and process clear in your mind and on paper. Good luck