I wish I could offer you a sure-shot solution, but I just don't know of any. It just takes time and we have to muddle through as best as we can. I had to truly force myself many times to be physically active during withdrawal (I tapered long and slow). Unlike you, I had the benefit of not working.
I think you are doing the right things with the hydration and vitamins.
Wish I could offer you more, but I do offer you my best wishes for success. Please keep us informed of how things are going for you, okay?