I over exerted the muscles in my arms earlier and they have been shaking since I finished what I was doing & it's hard for me to even hold my phone up, should I take flexoril I am prescribed for muscle and back pain? I ask because I do not want to fall asleep now however I also take vyvanse and have taken it so I wonder if maybe I wouldn't be as sleepy? Would the flexoril help for this type of injury?