Most doctors before the late 1970's advised patients to smoke cigarettes as a healthy, effective way to counter anxiety. As
the public began noticing reality differed from doctors' claims, the tobacco industry fought back hard, hiring doctors to support the pro-smoking platform. And even when international biomedical evidence linking tobacco use and various cancers was overwhelming, the tobacco industry lobbyists were successful for decades YET duping the public. There's no necessary link between what professionals feel and what's true.
Only hard biomedical evidence can substantiate illness claims. I'd love to see this evidence in support of the standing model of physiological disease as the cause of "mental illness."
More, and I say this with the utmost of respect for all your and others' prerogatives, there isn't a single rigorous or "good" philosophical reason anyone
must want to remain alive. We likely want to remain alive due largely to conserved evolutionary neurological, cognitive factors--not because of any necessary philosophically sound justification.
Sorry to butt in, but the pervasive medical (and therefore scientific) assumptions and poor cause-effect reasoning of psychiatry really need to be called out. I'm really, really glad you're not out on the street and have some life comforts. Hope you figure everything out as best for you. (Also, hope I didn't offend you.)
https://www.healio.com/hematology-oncology/news/print/hemonc-today/{241d62a7-fe6e-4c5b-9fed-a33cc6e4bd7c}/cigarettes-were-once-physician-tested-approved