What Legal Rights Do I Have If Insurance Is Denying Life Saving Surgery And Saying It’s “not Medically Necessary”, And Doctors I’ve Seen Being Negligent.

I have dealt with a severe inability to eat since i was a toddler due to a vascular compression in my upper abdominal area, i’m 18 now. This has left me completely disabled and chronically malnourished, i also ended up with malabsorption in my gut due to it not being treated. It’s illegal for me to drive a car because the compression can causes random fainting episodes. I have osteoporosis and have become psychotic before from a lack of food or my stomach not absorbing it. Since i’ve had this since i was a toddler, i’ve had developmental issues including stunted growth and my face not fully developing as well as pretty much every symptom someone with a severe ED has, accept it’s against my own will. I’ve been to dozens of doctors and tell them i was only able to eat 400-1000 calories for the majority of my life and i was offered very little support. I’m currently begging and doctor shopping for one of them that’s willing to give me a feeding tube just so my osteoporosis doesn’t keep progressing and i can start physical therapy. I have at least 3 separate conditions that have happened from under eating all my life. I was also given the wrong medication by a doctor that wasn’t necessarily eligible to prescribe it and it caused a suicide attempt/ manic episode. Although a large portion of my “predisposition to mania and psychosis” comes from me not being able to eat enough. Oh and cherry on top, my doctors told me continue taking high doses of thc so i could eat 1 meal (without it i can eat pretty much nothing) even though it was making me hallucinate and become paranoid. As well as keeping me on the medication i had an episode on to make me gain weight even though i was asking for a feeding tube instead. I had real psychiatrists deny me medication when i was becoming agitated because they believed i didn’t have a psychiatric problem that was causing my issues, and referred me to different doctors for bloodwork. Is there anything i can do legally to at the very least keep myself from continuing to deteriorate and help me get a feeding tube at least. That seems like the only logical thing if the surgery “isn’t medically necessary”. There are a lot of people on feedings tubes for my condition when they can’t afford or can’t get surgery. But my doctors are either not comfortable or having issues getting them approved again? I’m not even 100% sure but every time i ask i don’t hear back or they aren’t able to get me set up. I feel like this is basic medical care and shouldn’t be this difficult or take this long. I will take any advice i can get that can get me to recover as soon as possible. I’m also not sure if since what i have is rare and a lot of people that went to med school are not very educated on it changes things. But i feel pretty deeply a lot of things were done wrong, and have hurt me and have the ability to hurt other people.