Nightmares and pregnant...

Does anyone else have crazy dreams or nightmares while pregnant? I am 12 weeks 5 days and i i have not been able to sleep in over a week (at least being able to stay asleep more than 3 hours at a time) i will wake up crying, sweating, breathing heavy. Some i remember and usually are about dying or having a miscarriage.... Does anyone have this problem? What should I do about it. Im so tired and im tired of not being able to sleep :(