You know, if you had suffered a physical injury that had become this debilitating to your quality of life, would you even think twice about having that injury treated? I don't think you would. You'd get the fracture set, or the surgery, or the physical therapy, and you'd get on with your life. So why are you refusing to seek help from a mental health professional to address this crippling depression/anger over the end of your relationship? You have to start figuring out how to cope with this break-up - without giving it the power to ruin your life.
I don't think it's helping your healing process by continuing to focus so much negative energy on your ex-gf. I understand that you miss her and want to reconcile, but her lack of desire to reconcile doesn't make her cruel. By continually reinforcing the idea that you're never going to be happy (or even feel better) unless she takes you back, you're keeping yourself firmly rooted in "day one" of the break-up.....and that's hurting you so much more than you need to be hurt.
I know it may be hard to accept that she doesn't feel the same way as you do, because she actually used to share your feelings. But you have to start accepting that her feelings have changed, and that she broke up with you because of that change. It's not her responsibility to support you any longer....and if you keep turning to her for support, you're going to keep being disappointed. Give yourself a break, and start looking for support from someone what can provide it, okay?
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What you feel is what you are and what you are is beautiful...