R. Hand goes numb when I sleep on either side, arm stretched forward, also when reaching forward during the day using mouse or bike handle. Not carpa?

Nerve issue in neck. Have you tried chiropractic? Possible pinched nerve where it comes out of the head or neck.
See your doctor. This is one of those problems where a visit to your doctor is necessary to figure out what's going on. Only after a thorough evaluation, including examination and possibly labs and other tests, can your doctor correctly diagnose you and treat you effectively.