Turner's Elbow - what is it?

If not mistaken, it's not the same as Tennis Elbow. I've heard it
mentioned, and a few websites have tools they claim will help or prevent.

I took a week long class, and developed a wicked pain in my elbow. It gets
better, and then worse, seemingly without reinjury. I wore an
unprescribed armband (Band-IT) but had to wear it in differently that
recommended for TE, and while it helped a bit, it made my upper arm
tingle.