I completely relate, OP, but these things really can and do help.
Camomile tea before bed
LOTS of fresh air
Exercise. As much as you can fit in (I always have to give myself a kick up the backside for this one)
This Works pillow spray did actually help, but you do need to wash your pillow a lot.
The biggest tip I could give you though is..
DON'T STRESS ABOUT HOW MUCH/LITTLE SLEEP YOU GET
Easier said than done, I know, but the more you worry about it, the worse it becomes. I don't mean you just accept it will always be awful, but it's a progressive mind set and eventually you should start relaxing and so, sleep better.
It drives me mad when people tell you you need 8 plus hours or you'll get xy or z disease
Yeah....that helps. Thanks!
Also, don't tell people, like friends etc, that you don't sleep. By saying this (I believe) you're almost setting that in your brain as a fact. A constant. It isn't.
I had to stop talking to my mum about my sleep, as she's always been a terrible sleeper and when she found out I was struggling, she seemed pleased we could relate
so would talk about it ALL the time, in detail and it doesn't help anyone, so eventually I had to ban the subject. She wasn't happy and I told her why, because I wanted to help her, but she thought I was just in denial....regardless of the fact that I now sleep well 