I've been on 10mg.flexerill since 2014, due to car accident, and being diagnosed with" cronic whiplash syndrome". Because the neck & back pain & spasms. I was curious if any one out there was having opposite effects, as in "severe muscle constrictions"? As in waking out of a dead sleep, having to get out of bed, strech & massage out "charlie horse" or in this case, charlie calves,& forearms ? Very painful & scarey.