Sorry to hear about your issues.
Loss of feeling/tingling is a symptom of impaired nerve function, which will lead to overall strength loss without you necessarily perceiving it.
I had a similar issue (the tingling, etc) on my pinkie and ring fingers and started to use these:
http://www.ironmind.com/ironmind/ope...nsofcrush.html
I'm currently working on the #3 gripper after starting off with the trainer. My hands have become MUCH stronger and the numbness on the ring finger and pinkie is gone.
You can also try switching hands for the sake of diagnosis. I have a friend who is right handed but uses his mouse left handed. It got rid of his carpal tunnel symptoms.
I do practice shooting 20% of the time with my off hand (I'm a lefty). It's good in case you're in a fight where your strong hand is disabled in any way.
I hope this helps you.
Regards,
Arkdweller