welcome to Healthcare Magic.Hypertension
is one of most common reason for nose bleeding. In stress and anxiety
there is tendency of increase in blood pressure, which may lead to nose bleed in your case.
Stress and anxiety can cause headache/chest pain
due to muscle spasm. But as you are getting unconscious spells, your case need to evaluated by general physician and psychiatrist
to rule out any serious issue and treatment.
Wish you good health and all the best.
Dr Ashish Kumar Mittal