Yes, that's a very good idea to take the videos with you.

If you are already in pain bad enough to need those injections it must be awfully painful having the movements now as well.

p.s. you could also look in PubMed for drug induced chorea.

I do know some drugs can cause it but I wasn't aware that an epidural steroid would be one of them. Unreal.
It'll be good to see your Neurologist and really get to the bottom of it all and hopefully things will improve for you.

The Neurologist will probably do more tests and get all the previous test results together and try to determine if this is indeed a Secondary Chorea and go from there.