Had the same problem after trying something stupid as a newbie about 10 years ago. Decided I would shoot without a glove for a week.
My ring finger started going numb and it also had some sharp stabbing pains. Finally, I quit it but it took about a year for it to go away.
I would seriously doubt its carpal tunnel especially if it's in your ring finger as that is not the typical finger to be involved. What you are getting is a peripheral nerve palsy due to excessive compression on the finger. All the doctor is going to tell you is to stop doing what your doing that caused it to come on in the first place.
I was tilting/torquing my hand forward/wrist down in such a way that my ring finger was doing 90% of the pulling. Video tape yourself and I'll bet you see a flaw in what your doing. Like the guy above said if you elbow is really high that puts more pressure on your ring finger. Focus on making your middle finger do most of the work during the drawing.
I had to put something over my ring finger to pad it up during the drawing process. What I found worked the best is called coband or vet wrap. Its a self adherent bandage material that has a waffle-like texture. It great for wounds and in this case padding up your injured finger.
I would say the calf hair tab just made you change how you were drawing. So the tabs not why your finger went numb but it did change something about your draw which is causing your finger to go numb. I'm afraid it will take a while for this to completely go away but it should as long as you correct the form. In the mean time you will have to find some way to reduce the pressure on your finger while it heals. Nerves take anywhere from a few weeks to a couple of years to completely heal depending on how bad the damage.
Chris