what do i do after i turn 26?

i have am nearly bedridden by my autoimmune disorders which require frequent trips to different doctors and urgent care clinics/emergency rooms. i am 19, so i’ve got quite a while before i’m kicked off my parent’s plan, but my disabilities aren’t going anywhere - i cannot work/provide for myself and i would not be alive without my parent’s health coverage.

with the way things are going in the US, i doubt medicaid will be around when the time comes and i am terrified. is anyone else in a similar situation? i’m open to any advice/suggestions.