Do try the stretch of open hand, fingers back, throughout the day. The point is to release that pressure on the nerve. That's the purpose of a brace too.
Also, I forgot to tell you to massage your arm all the way up to the front of shoulder/clavicle region to promote improved circulation. The nerve's pinched area can be in the elbow or all the way up to shoulder/clavicle. Right now, I forget the nerve's name and route but it is in your basic nursing anatomy book. Knowledge is power!
And don't forget to ice (for swelling & pain)... like always, 20min on, 20min off.
Cathy