I am so pleased that the blocks helped you a bit.
As for the numbness I think it is just another side effect of RSD. My leg can be numb at night but I get really bad pain in it too - strange I know!
Do you sleep on that arm in bed? sometimes sleeping on a limb can cause the limb/fingers to go numb. I would speak to your PM dcotor about your problem.
Pain free hugs
Alison
PS: Keep touching the finger with your other arm or with feathers to try and get some feeling back