Hi!
I'm fairly new to all this, but for sore, stiff muscles or sprains I've been using a blend called "Panaway" that contains Peppermint, Wintergreen, Clove and Helichrysum. My family swears by it; we take it to Taekwon-do with us! I think sufferers of epilepsy have to be careful of/avoid wintergreen, so it might pay to check that out. Wintergreen gives off that fantastic "deep heat" smell you often notice in sports rubs!
Cheers!