I can prescribe you two things that will help you, and might cure you:

Meditation and exercise.

I would not recommend meditation before bed as it can have the opposite effect, so I do it first thing in the morning and once in the afternoon. What will help you more towards sleeping is something physical, work up a sweat be it walking, running, or lifting weights. I myself like to ride my bike.

If you do one of these it will help, if you do both, I guarantee you that you will sleep better.