Kell, I think Trish is right... I remember being told something about Baclofen and blood levels... and that it should be taken regularly, and not PRN (as needed) in order to work properly...
yes, I have "specific areas" of spasticity.
it used to be always my right leg for the last ten years, mainly the calf and foot... my toes stand UP and holler for attention... gentle regular stretching seems to help.
don't want to scare you, but... I've got muscle twangs going on with my left leg, behind my knee, down the calf, and in my foot.
*shudder*
and brand new this week, my left shoulder and forearm are twinging.
not at agony-levels, but just enough to annoy, irritate, and cause me to wince a wee bit.
here's a hug

and hopes you're feeling better soon, honey!