What else can I try to put and keep my asleep?

I have been to the dr's 4 times, Ive tried Lunesta, which doesnt work, just gives me a metal taste in my mouth, ambien, which does help a little but I wake up an hour later, Ambien Cr, which did help, but the dr only prescribed for 2 weeks, she said she didnt want me to rely on them.I was then prescribed Trazadone, which doesnt work, and gives me bad nightmares.I have also tried over counter sleep aids, Melatonin, Kava Kava, Valerian root, and Chamomille tea to no avail. I am allergic to milk, so I cant try that.Im a completely frustrated and dont know what else to do.I have tried the relaxation type treatment, but I still wake up continuesly.Is there anything else I should do? Or just get a new doctor?