Sorry to hear that happened. As patients we need to be able to ask questions.

Just a suggestion but you really need to find a Neurologist who is familiar with Movement Disorders specifically and even then you have the choice of getting a 2nd opinion (or more if needed). I had to do that here for my son.

I would be cautious under the circumstances you are in and wouldn't put it all down to the epidural steroid until a Neurologist who is familiar with movement disorders is able to rule out all Primary causes of Chorea and is investigating the Secondary causes.

All the best. Please keep me updated in the future if you can.