I have been suffering from forearm tendonitis of the inner elbow (aka golfer's elbow). Outer elbow joint tendonitis is referred to as tennis elbow. I recommend a youtube search for exercises related to what you are suffering from. They have helped me.
I purchased an arm strap that I used for a month or two which helped - this one here: http://www.amazon.com/gp/product/B006L9AQV2/ref=wms_ohs_product?ie=UTF8&psc=1
While my tendonitis has not completely gone away I have stopped using the strap as my forearm is getting stronger. I have also switched routines to more of a basic strength / power lifting routine and don't do arm curls anymore (which were the primary culprit in causing my pain).
Lastly, though I have not done it yet, I have read quite a bit about Active Release Technique (ART - http://www.activerelease.com/ ) and it looks like it may have some promise depending upon whether your issue is a tendon tear or build-up on the tendons/muscles.
Hope that you get some relief soon. I completely understand the frustration.