I also experienced considerable pain relief from Savella, but my doctor discontinued it after a month due to intolerable side effects.
I experienced the hot flashes and although they are certainly annoying, that is not what caused me to stop taking the Savella. It was the excruciating vice-grip headaches that I experienced while on Savella that led to my discontinuation.
Isn't it frustrating how a med seems to improve things in one way, only to mess things up in another area? grrrrr... I just want a happy medium.
P.S. Hope you don't have too many side effects from your slip and fall.