id say worrying about it is possibly making the situation worse.
But theres more to it than that. Have you tried relaxation techniques?
Keep as active as you can throughout the day, walk/ sWim.
Lay in the dark at night, but if you cant sleep find something qUiet to do, painting, reading, writing, scrapbooking. But stay away from tv, the internet etc as much as you can.
Watch out for caffiene.
All of this you may have tried i know but they are still the best first steps.
I hope your pdoc may be able to help.
I only sleep 4-5 hours a night. I try not to worry too much about it.