Sounds like this could be related to repetitive work injury. Besides playing bass, do you do other activity with your right hand fingers? What about computer work and hitting the mouse really hard? Trace back the things that changed prior to having your injury. Could be a pinched nerve (carpal tunnel) that is affecting your fingers?
Check with a doctor, and make sure you rest and get into rehab to excercise your hand and gain strength again.
Check with a doctor, and make sure you rest and get into rehab to excercise your hand and gain strength again.