Suggest Treatment For Severe Insomnia

What do you suggest for severe insomnia - I have tried lunesta, restoril, clonazepam, ambien helped but had amnesia & needed at least 12 hrs. Before it was out of my system, I have tried doxipin, neurontin, Benadryl, - nothing seems to work. Could there be something wrong in my brain?? I get so achy all over & can t focus as well because of sheer exhaustion. I just can t shut my mind off & fall asleep. If I do fall asleep it is not until about 5am & I have to get up at 7am. Getting desperate!! Can you help!