Sounds like you're having sleep anxiety. Its when you associate sleep with anxiety for one reason or another. I highly recommend you look into meditation. It probably wont fix your problem in a day or two, but if you do two or three 20 minute sessions a day you'll see results soon enough. Also, if you're taking more than 1mg of melatonin you're not doing yourself any favors. Studies show that more than 1mg can actually hinder sleep. Best dose to help you sleep is .5-1mg so best thing to do if you have the sublingual kind is to break it up.