Google "nerve glides" and click on the first link and do some radial nerve glides.
See how that feels.
The position you're describing is pretty much the path of the radial nerve down intot he forearm. If your nerves aren't long enough to stretch in rack position it puts a lot of tension on them which can lead to some minor tearing/burning/searing pain of the nerve as it's a bit stretched beyond it's limits.
Nerve glides should help fix that.
Take your fish oil, DO NOT WORK THROUGH PAIN, do the nerve glides and some other soft tissue work.
Let it heal up and nerve glides loosen it up... see how it feels in a couple days and get back to me.