Wow, we are very similar. Yeah, preworkout is what makes it easier without weed, though I guess our difference would be is that I never decide to not go to the gym high (if I'm not on a tolerance break that is). I also went back to drinking a beer every now and then since I don't have weed, but with weed I almost never need or want alcohol. The reason for both is as you said, I just like the mental feeling, it's different and better than what I usually feel.

Your tolerance should drop, it'll help a lot if for those two weeks you also don't drink too much either. Your liver actually grows in the consumption of any drug and when you don't use your liver to process alcohol or weed, it starts to shrink. I also do some fat-fasting on my tolerance breaks which forces my body to use up fat storage (helps your liver shrink more and also get rid of those cannibinoids).