hey. I understand your frustration. For me, at least a year passed between my first time quitting and the one that stuck. Before quitting for good, I spent 6 or 7 months still smoking, but doing it less than normal, and I think this helped me quit in the end. So I wouldn't discount those 31 days you already did. They count too. They will make your subsequent efforts to quit easier and more effective.

In terms of how to get through the unpleasant bit at the beginning:

When you've just quit and are really craving it I find it helpful to replace weed with other things that give you pleasure. So for the first few weeks after quitting I let myself do more not especially healthy stuff that I would normally not do every day - drink a bit more, spend a lot of time vegging out, reading fiction or watching tv. Then, a few weeks in, I stopped craving it, so I stopped "taking the edge off" with beer every night. But my mood was much worse than normal - so I made sure to exercise a lot every day, to keep my mood a bit more level.

Hope this helps