i would make the nurse come back to your house to:

1. see how you give the shot and determine if you're doing it right.
maybe you're going too deep?
2. and to make her observe first hand the reactions you're getting. just because
someone hasn't heard of something doesn't make it untrue. instead of
dismissing you they should find a way to observe, report, validate and help
you.

i was on copaxone for 10 yrs and had a few problems but not what you have.
let us know. you could also stop for a few days and see how your body is.