You really shouldn't wait any longer. You've have it a few weeks already, and anything like this for two weeks or more should be seen by a doctor.
This is the ulnar nerve that innervates the area of numbness for you, so it is some sort of ulnar neuropathy. The doctor's job will be to find out where and why which could be anywhere from your neck to your wrist. It's probably some sort of muscular entrapment which can be helped by physical therapy, massage and exercises.