I have fibromyalgia and myalgic encephalomyelitis/chronic fatigue syndrome, and take amitriptyline for insomnia with no adverse side effects. While it is difficult to get to sleep at night, the amitriptyline helps me to stay asleep through the night. I use a low dose of clonazepam to get to sleep. When I first started using amitryptyline, the full 50mg dose really hit hard, so I experimented with cutting the pills in half, and then into quarters, which helped tremendously. If you can take benedryl, so be it. I have asthma, so I am unable to take antihistamines on a regular basis, as they dry the mucous in the lungs.