Hi im worried about myself. im a singer and sometimes on stage feel like skipping moments of stage present like my brain stops working or feelin dizzy?

Several reasons: Several potential reasons for your symptoms- psychological (anxiety attack, for example, ), cardiac (like abnormal heartbeats or a very high heart rate), or neurological (for example, inadequate blood flow to the brain) problems may be the causes. See your doctor to discuss your aspecific signs and symptoms.

Hard to say : Without physical examination, but it sounds like you might be describing petit mal seizures. Get to a neurologist, at least a primary doctor. It could be something serious.