@Audrey *********
highly doubtful you will get a medical extension.
You have successfully lived in Thailand since 2019 using every possible variety of visas, extensions, border and visa runs.
Time to really decide what is your Plan B.
If it involves working in Thailand...get a job which offers a Thai work permit with opportunity for a trailing spouse.
One more visa run to Cambodia for a VISA may give you one more opportunity on return to get that job...
Or attend a Thai university studying for a Bachelor or Master's degree..
Your options are limited if not age 50+.
And frankly speaking...
Returning to Thailand visa exempt would not be wise with your long history of living in Thailand.
Try it with a tourist visa or Non B as teacher if you can find a job quickly.
I wish you well and success...
But your road ahead is indeed challenging.