Hi Cosmo Girl!
Just want you to know that you are not alone, my problems began with severe insomnia, I felt like I had adrenaline coursing through my body at night. I too was convinced I had everything from thyroid disease, Mutliple Sclerosis, Epilepsy...the list goes on.
I now sleep just fine 90% of the time, I have overcome much with this problem, with the help of medication. In my exp (its just my exp) Ambien and Lunesta do not help with anxiety and made me feel groggy but still unable to sleep. I have been through just about every medication for sleep out there. Klonopin helped tremendously in the beginning but you grow tolerant and I did not want to raise the dose. I now take Lexapro in the Am and as needed take Seroquel (12.5-25mgs) at night. I have had success with this and minimal side effects.
I sympathize with your plight, please let me know if you have any questions of if you just need some support!