Greetings, I'm sorry you are having such a hard time of it. I do not think magick can help with bipolar disorder, only your Doctor will be able to help you there.
With your PTSD, which I seem to have too, I think only time will cure, talking about it may help, taking care of yourself, meditating, working with Rose quartz might work.
Ask the Goddess to help you have control over your feelings, to protect you and make you feel safe.
There are people who love you, never forget that. I know how hard it is to cope, one day at a time.
Millie, take this from someone else with depression and occasional suicidal thoughts:
There is no spell, and depression will not just *poof* go away.
There are, however, coping mechanisms. In fact, a lot of psychological techniques were pioneered by occultists. A lot of cognitive therapies, for example, use the exact same techniques used in some occult traditions.
Magic is change in accordance with will, yes. And coping with, lessening, and hoping to eliminate depression is a very desirable change. However, it is a process, and not an instantaneous event.
Another practice which has been proven helpful for many with your problems is Mindfulness Meditation. I'd suggest reading the book "The Miracle of Mindfulness" by Thich Nhat Hanh for a discussion of how this works and suggestions on doing this sort of meditatinve practice.
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