I was on Seroquel for a few months before stopping. Like you, I tapered off slowly. I don't think I noticed any serious withdrawal effects. I did have insomnia, but that's not too unusual for me, so I can't be sure it was due to the Seroquel. I tried melatonin, and it helped a little but not much. You can temporarily try a benzo in moderation if the sleep issues really get too bad. The bad news is that the withdrawal effects vary widely per individual, so they can be hard to predict.