As someone who is handicapped through no fault of my own, it fills me with sorrow that you feel this way. Self-harm through neglect is no way to live.
My handicap initially left me with no way to walk for nearly 2 years. No doctor would touch my case. My kid literally could not hug me. I was dependent on so many people during that time and could barely take care of anyone else.
I cannot tell you what to do.. but I'm probably not going to live very long anyway (thank you, genetics!), so I'd like to encourage you to find purpose. I found my purpose in creation by sewing, and it brings me overwhelming joy. My goal is to continue creating things to spread that joy to others.
If that doesn't convince you, please know this: there are evil, shitty people in power out there who revel in your self-destruction and actively want you to destroy yourself. Please do not let them win. Continue to do your best in order to spite them and help people who aren't so fortunate.