I'm no expert, but stress has powerful effects on our physiology. It may be that a tense muscle in your back, shoulder or neck has pinched a nerve, causing it to feel numb. Unfortunately, there is no way of knowing exactly what is making your head feel numb... The key issue seems to be that you are scaring yourself with your thoughts... you may be making the symptoms worse! It is easier said than done, but worrying does not serve us any purpose, except to make us feel miserable. I hope you can find some peace of mind until you are able to be checked by a doctor.
