I was told there was absolutely nothing wrong with me, too - by THREE doctors! It's so frustrating, isn't it? Especially when Dp/Dr is so very difficult to describe. Don't they think we'd ignore it and move on if we could? Don't they know we wouldn't be there, trying to get help if we didn't think we desperately needed it? Don't they pause to think we might actually know our own minds better than anyone else, and that we know something's not right? It makes me so mad... :x
I believe you WILL get better, it's just a matter of 'how long' it will take. You're in the best possible place to get help and tips. People here really care. By the way, I've felt 95% recovered for many months now, and I can thank the people on this board for this.
Perhaps you're having nightmares because you feel so frustrated and angry with the doctors, but can't get it out of your system when you're conscious? You could try drawing faces of them (It doesn't matter if you can't draw very well, as YOU'LL remember who's who.), then stick them on a dartboard and fire away... Or maybe draw and cut out an actual life-sized paper figure of them, then tell them what you'd really like to be able to say to them, or shout, or scream... You could even make some voodoo dolls (only joking about the dolls!)!
I don't know if anyone else here could make some suggestions, and I don't know if this would stop your nightmares, but it's surely worth a try?
When I was young, I used to have recurring nightmares about a main water pipe bursting in my room, from behind a picture or even just the bare walls. It would spray out under tremendous pressure, then another
pipe would burst on the other side of the room, then there would be old-fashioned shower-heads everywhere in the room, spraying water all over me. I could barely breathe as I tried to run through them and escape. My friend told me that next time I have this nightmare, all I've got to do is just simply turn off the stop-cock. This actually worked!
Don't ever give up on your battle with Dp/Dr. One day, you WILL win.