Before I had PGAD from the PNB with Depo Medrol, I had burning and electrical shocks and started taking 10mg of Amitrip... and to get relief I went up to 60mg to 70mg, I can not remember exactly. But it really helped and I could work full time , which was amazing.
BUT...
I think Lexapro is a newer drug with less side effects and if it were me I would consider taking 5mg of lexapro and maybe working myself to 10mg .
I took Amytrip for 4years and in 2010 after feeling ticks and sudden jerks, slowly over time (for instance, my shoulders in unison would shrug for no reason , or my wrist would jerk away from the key board when typing), I woke up a month or two later with full blow dystonia, so be carefully to all who are reading this and are over 50. Amitriptyline tends to be more apt to turn on you the longer you are on it and the older you are. I was 52 when it turned on me

Prayers for everyone for guidance and peace,
Sadie