My husband has back pain from arthritis and bulging disks that have been operated on. He is on Lortab, flexeril for cramping in his muscles, Lyrica for pain and burning with numbnessin his legs and sometime arms, cymbalta and remeron. He also takes Lisinopril for high blood pressure. Sometimes when he trys to get out and do something he gets the shakes in his hand and in his body. Sometimes he gets it just from sitting still. He says he feels like he's about to jump out of his body. I'm not sure if this is a side effect from one of his meds because he's not trying to get off of any so its not withdrawal.