you may just be pinching a nerve in your cervical spine area, usually if a nerve is pinched just right it tends to make that feeling in the arm and all the way to fingers being numb. You may want to go to a chiropractor and have an x-ray done to see if maybe there is a possibility that you are pinching a nerve or have a slipped disk. Then also have them do an adjustment to your spine and in a few days you should feel better if the problem persists then go to a Dr and have them do a MRI
You have exactly the same symptoms I had a few years ago. When the pain increased and became severe, I went to see the specialists. Upon MRI, it turned out to be a case of Herniated disc in Cervical column of Spine (C5-C6). I had to under a long bout of Physiotherapy to come back to narmalcy. However, I am forced to take certain preacutions with posture, movement and activities. Don;t worry, it is not life-threatening but it can be nagging. With little care, you will be OK.