The fact is that if you have most illnesses you have do almost all of the work of healing yourself.

Even with a physical illnesses which has some kind of magic bullet cure if you don't put the work in to get better and keep healthy in other aspects your chances won't be great.

Mental illnesses do get resolved but not by doctors. Some times you just grow out of them. I've certainly known trans people do that, it's unfortunately pretty common that 5 years after full surgery they will realise they made a mistake and want to be changed back.

Weirdly though antidepressants do seem to get rid of gender dysphoria in some men, probably because they kill their libido. There was good research being done into this 20 years ago but it all got shut down by activists. That's the trouble with mental illnesses, to get better you have to admit you have a problem in the first place.