I am new to this - looking for a safe yes i mean safe (if it exists ) been on Amatripline for some 10 years - started to get fast heart beat, have come off them but cannot sleep at night wake up around 4am and then nothing - should i go back on Amatr. and get doctor to keep an eye on heart beat. They really have helped me. Tried herbal stuff ie: valerian etc. but not much use. Any suggestions most appreciated. Ruby.