Hi Ben
Like you and others, I also seem to have an over active mind. I have been taking zopiclone for the best part of four years but have cut down to a very low dose over about a six month period. I think that the comments on this site reflect widely differing experiences with effective dosage and withdrawal rates - seems to be a very individual experience.
I think it is worth trying meditation if you haven't already done so - you may find it is a helpful (and gentle) form of relaxation.