I'd like to join Sophie_M in welcoming you here, I'm glad you came as you sound in great distress and I'm also glad Sophie met you, as her suggestions are good ones.
I have no overall answers, I did however notice one thing. At night your thoughts race and you are unable to use distraction. That is a loss, as I've found it has been of great value, either though visiting an imaginary place I have in my mind to go to (ask me about it another time), or else reading something I know has made me feel good in the past. Other things I use too.
I'm not suggesting these are the things that would be effective for you, however what I found it was the difficulty in breaking that chain of thoughts the biggest barrier to giving distractions - of any sort - half a chance.
If you have not done so already can I suggest you practice using a free smartphone app called Smiling Mind. This has lots of exercises for all levels of ability (even mine) and when I use it I come out from a session with that horrible loop of thoughts broken and in a temporarily calmer state.
It's at that point pre-planned distraction can actually take your attention and work.
You can download that app starting here, for Android or iPhone:
I do plan what I'm gong to do in advance, so I do not waste that calmer time and just as importantly do not have to think.
Might this be worth a try? It does take practice so you will not succeed the first time you use it, concentration comes from prompts, but when you get even half successful amazingly it works!