putting it out of your mind is what is contributing to your stress/anxiety level. things will only continue to get worse if you do not deal with them. it really sounds like you are at a critical point here.

if you have a GP, you could consult with him/her about your anxiety. you dont necessarily have to tell about the voice/masked individual if you are uncomfortable with that but do state that the anxiety is out of control and interfering with your daily life and ask for a prescription for antianxiety medication to help you get thru and a recommendation for a therapist to gain some coping/stress management skills.