I've posted before on this topic, so I'll keep this really brief and you can search if you want the long form: I have found doxepin on its own to be ineffective. (You can get the liquid form intended primarily for children if you want to experiment with dosages other than 3 or 6 mg.) However, I've found the combination of doxepin and ramelteon, both of which are very safe, to be so effective it has pretty much weaned me off zolpidem, which is a lot stronger than amitriptyline.

Agree with tallbackhip that if you haven't really focused in your sleep hygiene and can find a CBTi psychologist (they are not thick on the ground), it's best to start there before hitting the drugs. If nothing else, better sleep practices will make the drugs more effective and potentially allow you to use less.