Amitriptyline
"Been on and off this medication since November 2014 after a stint of three days with no sleeping thanks to my chronic anxiety/panic disorder.  Started out on 50 mg but I couldn't tolerate it, so I tapered it down to 25 mg and it worked like a charm. The first few days are awful with the dizziness, foggy head, just getting the day started can be a royal pain. However, I had some amazing sleep taking this, just hated the feeling of being drugged. I tried going cold turkey off this medication and let me be the first to say DO NOT GO COLD TURKEY!  I was so sick and shakey, muscle cramps/spasms, severe vomiting, worst flu like feeling you'll ever have. I broke down and cut a 25mg into 12.5 mg.  muscle pain lingers but everything else is better."