Left sided back pain , numbness etc.
Last night I started to experience pain all on my left side of my upper body . There was throbbing aches from my hand through my arm to my mid back . It was like in waves . My hands seems more numb and weaker. Is this normal ? Should I got to the ER?

If it has lasted for 24 or more hours call your neurologist and they will tell you next steps, it could be a relapse or possibly an infection they can help you figure it out.
I'd think if it lasts more than 24 hrs ask you're neurologist.