What can I do to stop obsessive thoughts? I am medicated for this but can't seem to stop.?

I am under the care of a mental health provider. I am prescribed prozac, lamictal, buspar, and recently resperdal. I am very obsessive and over critical. I find myself laying in bed crying obsessing over things that I can't change. Recently it has been the break up of a boyfriend of only 3 months. I know that he was no good for me and was making me into someone that I didn't want to be but some for some reason I am obsessing over this and don't know if it is just because I am lonely. Last week I was supposed to be on a cruise to celebrate my sisters 40th but when we got to New Orleans I found that I had forgotten my passport. Talk about ruining someones birthday. It happened the same day as the break up. I laid around and cried for a week. Prior to this I continued to freak out at work due to the amount of work that I had to do and I continued to obsess over it. It is like I can't turn my brain off. It just gets racing faster and faster. And the thoughts snowball. I have looked up lethal dosage of medications but don't think this is anything that I would do.....I just want my brain to stop. I just got off ambien because I was abusing it to sleep since that is the only time that my brain doesn't obsess. I just want to know if anyone has found a successful way to stop obsessions.