HiI had my first Botox injection in October after being diagnosed in August. I had the symptoms for two and a half years prior to this. I cannot say I had any pain when speaking although I did have a dry throat and also was constantly clearing my throat. My speech therapist recommended sucking boiled sweets to keep things lubricated and make it easier to speak. Have you been offered Botox injections? if so, speaking from my personal experience I would say go for it as I have had excellent results.
Good luck
Iris