Hi I m a 20 year old female. About 2-3 years ago I started getting very lightheaded and it s constant. Everything goes black my head feels like it s pounding but also shaking and my knees start popping like they are about to collapse on me. I have collapsed twice every other time I stand there. I can t hear everything that is going on and I can talk to you while it s happening. I am a smoker I usually smoke a half a pack or a full pack a day. After the lightheadedness I can feel the veins on my forehead and in my temples pulsing. Is this something serious should I be worried?
Hi, I have read your query & understood your concern.  From your symptoms I feel possibility of following conditions causing your problem- -Severe anemia-with history of fatigue, pale skin, brittle nails.  - Hyper ventilation -due to stress/anxiety.  - hypoglycemia-due to weakness following low blood sugar - Swelling of middle ear-associated with vertigo.  To differentiate the cause you need to visit a doctor for examination/investigations, to be followed by specific advised treatment. Treatment.  Thanks.