How long is it gonna take for me to get on the right combination of medication and be stable?

Ive been getting help, I've been going to therapy since december (of last year) and I've been taking medication since this march, and on almost all of my psychiatrist appointments I've needed to start taking more medicine, or I needed to go on a higher dose, just over a week ago I got my seroquel xr doubled, and now im on 300 mg seroquel xr to stabilize my moods (which are rarely a problem, but when they are a problem they are just as bad/worse than my lengthy depressed/anxious spells, at times i feel happy one minute, and miserable the next and it makes me feel so unstable, like im losing my mind) and 30 mg celexa for my depression, and I used to cut a lot, and im still tempted to cut a lot at times. When can I really be sure that im finally stable and not just feeling good in the moment?