Hello, You have not given any history of past illness, you fell in the shower and had a fainting experience. Presently you are feeling light headed after hurting your chin. You are suggested to get clinically examined by a GP, get X-ray, MRI done to detect any fracture, ligament/ tendon tear or any internal injury due to fall. You will be accordingly treated. Dizziness or lightheadedness is commonly due to low blood glucose, low BP, dehydration, stressful lifestyle, lack of adequate sleep, vertigo, symptoms of migraine, vertigo or developing heart disease, etc. Take plenty of water, soups, juice, warm beverage to balance the body electrolyte system and compensate for sodium-potassium depletion. Maintain your BP and blood glucose. Take adequate rest and quality sleep. Avoid stressful lifestyle. Your treating doctor will tell you to do few blood tests, urinalysis and other investigations to detect the pathology causing you discomfort. You are suggested to take a complete medical health check up done. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Nupur K., General & Family Physician