Interesting. I have never heard of epidural steroid injections causing Chorea.
I only know of it as a condition involving the Basal Ganglia in the brain.

Have you ever looked at a video of someone with chorea? There are some on YouTube.

It might be useful for you to do that to see if your movements are like that.

My son is fine. All grown up now. He didn't have any heart involvement with his Rheumatic Fever, so he was lucky. He does have other conditions that affect movement though.