K.W.
I've had anxiety/Obsessive Compulsive Disorder since I was a child, but was clinically diagnosed with it when I was 19 and went through 18 months of cognitive-behavioral therapy. I've always been riddled with nightmares and twitching - some more noticeable than others. It's not fun, it can be extremely embarrassing when my young students notice a twitch and ask why I'm blinking my eyes so much or why my hand is moving like that, and my husband has to be a saint for putting up with my moving around while trying to get to sleep, my nightmares, literally checking for monsters for his 32-year-old wife, etc. My children are still young, but I work VERY hard not to pass along my feelings of anxiety to them - not always easy to do!
All I can say is that you have to have a lot of information and a VERY good sense of humor! Do the study, see whomever you have to see for insurance purposes, but get yourself a diagnosis, therapy, and adjust meds as needed. Life can be very close to "normal" for ladies like us, just be thankful that yours are primarily during the night and that you have a supportive fiance.
Also, realize that at the heart of it, anxiety is a chemical imbalance. Your brain doesn't make enough serotonin (the feel-good stuff in chocolate) so when it disperses it to the body, it realizes it doesn't have enough anymore and "slurps" the stuff it just dispersed back up. It's a never-ending cycle of dispersing and slurping that always leaves you in need of serotonin. That's why anxiety meds are SSRI's - selective seratonin re-uptake inhibitors - they add serotonin to your system and stop your brain from slurping it back up. I find it VERY comforting to think of my issues as a "simple" chemical imbalance rather than a big scary mental health issue.
Best of luck to you!