Suggest Treatment For Severe Insomnia

I have been struggling to sleep for around six years.If I go to bed without any pill, I stay up till morning. Pills so far I have tried include Lexatonil 3mg, Dormicum 7.5mg, Nightus 3mg, Tenaxit ,Tryptin 25mg, Disopan 0.5 & 1 mg and Sedil 5mg. All these were prescribed by different doctors and none of those worked well for long. I need to mention that I m a smoker and kind of addict to tea and coffee.Even if I don t drink tea or coffee, I can t sleep.Also, when I can t sleep for one single entire day, I can t sleep on the very next night. Now, what can I try this time? I want something which would work on me and won t be too addictive. Response from any doctor would be very much appreciated. Thanks in advance.