you may need something to help you sleep, ask your dr. personally, i hate drugs(still on a lot, for now) i found a supplement with black cohash that helped me sleep some. you've prob already tried cutting out caffeine, not exercising too late. don't post and read here the last thing before bed, do something mindless to relax, so you won't go to bed thinking about it so much.
some antidepressants cause insomnia, too. i have a relaxation tape, and a "safe room" tape that i listen to every night as i go to sleep. i don't usually make it all the way trough any more without falling asleep. if i could stay asleep, it would be great. my therapist gave me the tapes-ask your's about some.