How long does withdrawl effects last from 600mg pregabalin, 30mg citolopram and 10mg nicotine. I have gradually come of all of them and am now clean?

You should be fine. If you are clean from the meds your should be fine in a few days. Nicotine urges may persist for quite a while. Don't give in to them. The urges may be tough to resist at first but the longer you abstain the lower the urges will become.