Jessica, What you said really worried me. You need to call your neuro right away. Do you have one? What meds are you on, only the Pred?
You can get temporarily worse on Pred. When it does kick in, you may feel awesome or you may feel just ok. Everyone is different. What dose are you on?
What you are describing sounds like you are on the verge of a crisis, if not in one. If you can't breathe in well, you need to be in the ER. How close are you to Mt. Sinai? UCLA sucks, sorry, but it does. Unless you have a neuro there who can call ahead to let them know you're coming.
Seriously, the inability to do things with your arms is a HUGE warning sign. Do something and do it right away: Either call your neuro and/or go to the ER.
I hope you will get some help and feel better!!!
Annie