Pain in palm of hand and upper forearm caused by two-finger pocket but no pain in fingers: anyone know what this might be?

Earlier today, I pulled onto a pocket project in the gym; I reached for a shallow two-finger pocket, and as soon as I grabbed and pulled I felt a sharp pain in my upper forearm and the palm of my hand. Originally, I thought I had strained a pulley, but soon realized that my fingers had nothing to do with it. I feel no pain in my fingers, and the majority of the pain is felt in my forearm. It feels like a tendon injury, but I am not sure. I only feel pain when I engage my fingers (e.g. when I pull down on a hold or grasp something). Of important note is that while climbing, I only feel pain when my fingers are in the open position; when my fingers are crimping or in a half position my hand and forearm feels normal. I have researched online and haven't found anything about an injury like this. Would anyone who has some knowledge about something like this care to suggest what this may be and how to treat it?

Also, 3 days earlier, while working a problem with pinches, I felt pain in my palm that is identical to the pain that I am feeling today. At the time, I dismissed the pain; but now, I realized that there may be some sort of connection. Anybody know what happened?

Sounds like partial tear of forearm flexor, these tend to occur in pockety climbing.  Rest rest rest at this point, a complete tear could require surgery.  Symptoms may gradually improve, and allow you to return to baseline over the coming months, but this is worth seeing a sports med physician or physical therapist for.

Noah J, thanks for your response! After reading some more online, I think I did strain/partially tear my forearm flexor. I don't think I completely tore my flexor, as I can make a tight fist with minimal pain. I did not, at the time of injury, expect for this to require professional help, but I will consider seeing a sports med physician or a physical therapist. 

Check this out Reid:
https://www.mountainproject.com/forum/topic/108637314/possible-fds-tendon-injury
https://www.mountainproject.com/forum/topic/111896625/what-is-this-finger-injury

I sustained a very similar injury that I suspected was a lumbrical strain at the time.

After reading through Morgan's forums and reading about lumbrical and forearm flexor strains online, I'm starting to wonder if I suffered both injuries. 

I think that the pain that I felt in my hand a few days earlier was actually a very mild lumbrical strain that would have only taken about a week to fully heal. But since I didn't recognize the strain at the time, I didn't rest and climbed only a few days later. 

I think that I re-injured my lumbrical strain on the exact same move that I strained my forearm flexor. The symptoms of a strained forearm flexor sound exactly like what I feel in my forearm, and the symptoms of a lumbrical strain sounds exactly like the pain in my hand. And since my lumbrical was already weakened from a few days earlier, it would have been easier for me to strain my forearm flexor. What also makes me think that they might actually be separate injuries, is that certain movements and exercises sometimes hurt my forearm, but not my palm, and vice versa. It is probably worth noting that I injured myself on the first move that I truly had to actually try that day. 

This double injury-thing may sound kinda far-fetched, but if anyone has an opinion about, please say something. I have been icing my forearm and palm 3 times a day for about a half hour. If I don't notice a steady improvement in both my forearm and my palm after a week, I will seek professional help.