The Joys Of Not Being Able To Sleep

I have always loved to sleep, that amazing feeling of relaxing and then drifting off into a place where your worries just float away. Even as a teenager, I was usually in bed by 11pm. I used to get at least 8-9 hours sleep a night and I would always feel refreshed In the morning. 
But for about 5 years I have been struggling with sleep, when I was diagnosed with depression I would always struggle to shut off. I had to use sleeping tablets to help me sleep, but it really did help and again I would sleep for around 8-9 hours, and wake up feeling good. But for the last two years, since having this unkown and un-diagnosed illness I have struggled badly to sleep, and because of my massive cocktail of tablets to help (ish) with the pain, it means that I am unable to take sleeping tablets again. This has caused me a massive problem. 

At about 9-10pm I would feel so tired I would feel like I would pass out, so I would go to bed, but at soon as my head rests on my pillow, my head will be filled with thoughts and I can not shut off. Recently I have found that audio books have been my saviour. Espesially the Harry Potter ones, Steven Fry's voice is a soothing godsend. In the next hour I would end up drifting off. But this isn't the end of things. Between 3-4am I will wake up, and nothing will make my drift off. I have tried so many things. More audiobooks, Guided meditiation, Controlled breathing, ECT, but nothing works. So I will end up going downstairs and have a cup of caffine free tea and watch an episode of a programme or two. This helps me to feel tired again, but it causes some reprecussions. I would go back to sleep about 6am, which is ususally the time my husband will get up for work. I would go back to sleep and then wake up around 9am. Which would make it seem like I would be more awake. But when I wake up in the morning. I feel like rubbish, I feel like I have had no sleep what so ever. I guess this is a symptom of this illness, but it's horrible. 
For the rest of the day I will be completely exsahsted, and for a good 6 months I have never been able to do more than 1 hour of exersise or house work. During the day I will end up feeling so tired, and I will usually have a nap. Which I know some people may think is bad. But other wise I wouldn't be able to do anything at all. 

This is one thing I am hoping to control in time. But so far, nothing. If anyone has any reccomendations to help with this I would be so greatful. 

Thank-you!