Keep up the lacrosse ball rolling.
Ice your elbow and forearm.
Stretch your wrists/forearms.
Find some way to actively and directly work the muscle or muscles that hurt (wrist/forearm extensors). The easiest way will be to use the wrist roller. With your knuckles "up" roll backwards, or towards you. This should hit the muscle that hurts.
With knuckles "up" roll forwards or away from you. This will work the muscles on the bottom of your forearm (flexors) while stretching out the extensors, that are giving you pain.
Also, a stronger grip and wrists will help you keep the barbell more stable in your hands.