I feel your pain.
I injured my forearm a week and a half ago but not from any KB exercises.
I am very fortunate it only hurts when i rotate my hand clock wise.
It hurts about 50% less as of today.
I developed a good size bruise a couple days after it happened which means some type tear deep inside.
I only did two hand KB swings up to a couple days ago and get ups with no pain.Yesterday i completed a Vo2 max workout low volume with no ill effects.Moving foward with caution with the rest of my training.I will see a doc if i have any other problems.
How did you hurt your forearm?
Good luck on recovery.