Bluepalm, I'm so sorry that you are suffering with nightmares for so long. I've had years (though not as many as you) of nightmares myself, and it is truly a terrifying and horrible experience. To me, it is really a fresh re-traumatization, and when it is chronic (every night), it is just * on earth.
I don't have any experience with an alpha blocker like Prazosin. I'm not sure how well it would work. I've only been prescribed sedatives to help me sleep, which have their downsides. For me, sedatives was a "pick the lesser evil" scenario. I hope Prazosin works out well for you though! If not, maybe you could try some sedatives? If nothing else, they do keep the worst of it away, most of the time.
I'm doing a lot better these days overall, and trauma doesn't have nearly the impact on my life which it did, even last year. I haven't had any nightmares in months, but they were the most difficult symptom for me to rid myself of. After all of the work to heal from CPTSD in general (talk and action oriented therapy), my body still didn't know how to sleep properly, because it never learned. It wasn't until I took some really strong sedatives (most didn't work well for me), that I began to sleep well on my own. (I don't recall the name of what I was taking off the top of my head, but I can find it if you would like).
Basically, I took the sedatives day 1, then slept 14-16 hours, woke up for a bit, then went back to bed for the night (day 2) with no sedatives. Day 2, I slept better without taking the sedatives that evening. Then I would repeat the cycle. As my body began to learn how to sleep deeply on its own, I could go for more and more days between taking sedatives. After about a month, my body learned how to sleep, and I haven't taken any since!

Hopefully this will help you out in some way. All the best with everything. I hope you find some peace.
