How do I get her to let me go?

I’m 17, and I have 0 access to health care outside my parents, and they think I’m just a big pussy who can’t handle a “little ache” and worships “big pharma”. My dad is pretty chill and with enough nagging he will take me but my mom is crazy and won’t let me go. Last time I saw my primary doctor was 5 years ago since then I’ve started getting migraines, daily mild-to-tear-jerking headaches, my small stutter has gotten so much worse, my writing is suddenly terrible and I can’t get similar words straight like write/right and they’re/their/there, good smells are bad, random stabbing pains in my ribs usually followed by struggling to breathe, struggling to breathe on its own, and a weird bump on both of my wrists in different places that sometimes gets inflamed and makes it painful to move my hand.

3 years ago I was informed by a chiropractor I was developing scoliosis. I haven’t been back in 2 years, my gait is funky, my hips will pop by my leg joints then I can’t walk on it for 5-20 minutes, standing hurts, sitting hurts, lifting things hurts, and my entire spine cracks like pop rocks every other time I stand, and every 20-30 minutes when continuously standing.

But I’m just a pussy. If I complain too much, I’m just bitching, but if I don’t complain a bunch it’s not that bad. I don’t know how to make them let me go. My sister would fight my parents to let me get glasses and stuff but she moved out and I’m all by myself. I’m going to end up killing my liver with the amount of Tylenol I’m taking. Usually I can power through, but lately it’s getting harder to not take it.

Edit: we had a big fight yesterday after the rib-stabby-can’t-breathe-good-thing happened for like the fifth time in front of them(this was the first time they were sober enough to give a fuck). I’m allowed make an appointment but I have to find my own doctor and set everything up with her(male doctors make me uncomfy so my search is a little hindered)