Hi, my experience with Benedryl if you take more than the recommended dosage it acts like speed (at least for me) I feel like I'm crawling out of my skin and there is nothing I can do to make it go away. Ideally you should ask your doctor for a sleeping aid like Ambien. In a pinch, if you have klonopin or another benzo and take it with the melatonin it helps. In addition to all the pharmaceutical options I also will drink camomile tea, listen to soothing music, read a mindless book like Fifty Shades, practice breathing to slow my heart down and meditation. If I've laid in bed for tho hours and have not fallen asleep, I'll get out of bed and find something on TV that is hypnotic but not obnoxious. If it is really bad I'll soak in the tub with chamomile, Jasmine, and Lavander essential oils. This usually does the trick.
Good luck!