Want so advise from a frog of little brain? I know, I know I wouldn't either.
Guess what I'm going to give you some anyway.
I do understand about the nightmares. I had trouble even sleeping. When I did sleep the dreams were so real. I would wake talking to the person in the dream. Most were horrible dreams and I was at my wits end.
Pdoc and I worked for quite awhile finding the right stuff. I hate that over medicated drug effect. I was on Ambien for awhile but soon my body was overriding the med. I went back to waking every couple of hours. Finally came up with a drug cocktail that has been working so far.
Pdoc did say that a good sleep has a major effect on your daytime mood. I have to agree with him (that part doesn't happen very often) If you can talk with a pdoc about meds to get you to sleep or stay asleep or as in my case both. It's not perfect but the meds helped with the sleep and the sleep improved my mood.
Hope things get better for you.