What is my chronic insomnia caled? caused by stress & trauma

It seems like I'm high on alert. i try to sleep but i can't. it's been over a year or more. it happened straight after when i joined some place where i slept there with other people, i was in a bad mental condition state.. i was stressed out so much, that i wanted to suicide many times and run away and be isolated from the rest of the world, was a nightmare and hell.. i was very stressed out, it was only 1 month since it was ended.. and it was traumatic stress thing..

when i got out of there, i lost my ability to sleep normally.. i had bad headaches in the start from lack of sleep.. it was so painful that i thought i'll die if i won't knock my self out to sleep and wanted to call an amublance few times..

now 1 year after or 1 year and a half.. the things are the same.. i take melatonin and valerian to help me sleep.. but still doesn't help me much.

I took 10 mg melatonin, 4 grams valerian, 1 gram ashwagandha, 1 gram siberian ginseng....
and i didn't fall asleep.. i tried but was thinking a lot.. (It does help when i don't have to wake up early in the morning the next dat for shopping or meeting the next day only - but still without these supplements i can't sleep)

and if for example i know i have to wake up the next day in the morning...
things are worse, i can't sleep at all, or i sleep 2-3 hours, feeling depersonalizaton (shock un-real state), when it happens i cancel my meetings or any where i want to go because i didn't sleep at all the night. and also i tend to wake up so easily.. i used before the traumatic event to wake up normally, tierd and not want to get out of bed.. now today.. i wake up like an alarm clock full of stress.. literally in 3 seconds and i'm up, like i wasn't even sleeping at all.. un-refreshed sleep.. not normal at all..

anyways.. how do i call my insomnia exactly? in the DSM-V or something like that or psychiatric name or something..

also any clue what is the reason why this is happening after so much stress? what happens in the body exactly and physically that we're unable to sleep? mineral depletion?