i was kinda in the same situation. my advice to you is to quit the opiates. that spun me into some crazy depression. The hardest part is to get out of the vortex. i advise you to go to a music concert. I went and saw queen, and it helped me a whole bunch.
i took a week off from all drugs, and then started smokin buds again, and i felt alot better. Soul searching is good.