Being about to go on holiday and in need of sleeping better this was quite welcome. So, I'm back on 10mg amitripyline at night, sleeping well, but have had two common migraines since starting the course on May 26th. These seem to be reduce in intensity by a combination of Naproxen and Paracetamol.
Apparently it will take a few weeks before any improvement can be expected. The downside so far; dopy mornings feeling unsafe to drive, but this I'm told will wear off.