I take dosulepin which is a sister drug - I take it for pain (I have lots, as many of us do at this stage of life), for migraine prevention, and for mild depression (mostly caused by pain and migraine!).
It is a successful treatment for me - I sleep well, my pain is reduced and it is a very long time since I have had a migraine, so I am now happy to continue with it. Sometimes I think I wish I could stop it and try a dose reduction, but the problems come back, so it makes sense to keep going with it, as it improves my quality of life a great deal.