I have been on this med for 4 days....could not figure out why i ...

I have been on this med for 4 days....could not figure out why i was having such severe pain. had surgery for a bladder stimulator, and the doctor prescribed this to me to take post surgery. but heres the thing, they tried to give it to me through an iv before the surgery, and had a SEVERE reaction to it. i also suffer from severe lower back pain(I'm getting a spinal fusion next month) and i just thought the pain was from that. but the yesterday, i woke up and could hardly move. my neck, shoulders and upper back were hurting, burning and aching. i can hardly move my shoulders up and down. i also am experiencing the tightness in my chest, rapid heart beat, headache, dizziness. another weird thing is that i have what i can only describe as a sunburn on the back of my hands and arms. i have stopped taking the med, but i want to know is does all of this going away? i have so many other health problems, i cant deal with this. someone please let me know