This certainly sounds as if you are having peripheral nerve compression.
Numbness in the little and ring finger suggest a condition called "ulnar neuropathy", where the nerve in the groove of the elbow (also known as the "funny bone") can be compressed, and cause pain or numbness in the outer part of the forearm as well as in the pinky and ring fingers.
This can occur due to the pressure of the ligament over the elbow, pressing on the nerve, or by you, resting on your elbows while at a table, for example.
Also pains that are in the right thumb can be from carpal tunnel, where the median nerve is compressed in the wrist.
Often times, the best treatment is to remember to stay off of your elbows, not lie on your elbows at the table, keeping them padded so that there is no undue pressure on the elbows.
Should this problem persist, a test called a EMG and nerve conduction velocity can help to determine which specific nerves in the arm are responsible for the problem (and confirm the ulnar nerve as the culprit, if it is what we suspect here in this case), and then treatment can then be directed at that cause.