From what you wrote, it sounds like your sleep-related problems are pretty severe. So I wonder if it might not be a good idea to look into the possibility of attending a sleep clinic. You could certainly talk to your doctor about your insomnia. But my thinking would be s/he is just likely to prescribe some sleep medication which may help but which won't get to the root of the problem. Here are links to 7 articles, from PsychCentral's archives, on the subject of sleep as well as nightmares:

Sleep Disorders & Insomnia Guide

Do You Have a Sleep Disorder? | The Exhausted Woman

9 Tips for A Good Night's Sleep

14 Strategies for Sleeping Better

The First Line of Treatment for Insomnia That'll Surprise You

How to Eliminate Recurring Nightmares

https://psychcentral.com/blog/a-brie...dium=popular17

My best wishes to you...