<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hello, This has been happening to me since I became a teenager. My vision goes black for a few seconds and I get dizzy creating a sense of lost balance. I am female and have been a partial vegetarian for a few months now. Could you help me figure out what this might be. I have glasses for nearsightedness but I do not get headaches often.  <response>: Dear friend, welcome to Chat Doctor. There are many causes of this dizziness, imbalance. Can you elaborate more as to what else happens?nausea? Missed heavy heart beats? Sweating, loss of consciousness? Do you fall down?have memory of the event?it may be a heart rhythm disorder, anemia, autonomic imbalance, neurogenic syncope etc.pl. feed more details for a better answer. I hope to have answered your query satisfactorily. Take care, and please keep me informed of your progress. Good Luck ! May I request you to rate your experience here before you close. Thank you. 