I 21year old male. Since from one year i am suffering from head rotating round. Even at sitting or at lay down position also. When placed at the edge of height areas it is more observable. Feels like some thing is rotating circularly in head. It worsens when i move head suddenly. Then some visual disturbances also there like blurring. Some times ringing sound in right ear and some times pain. Even in sleep if bad dreams come ,then woke up and rotating head at lay down position itself. Even loud speaking hurts. Also headache at back and top of the head. Eyes feeling weighted. This condition is regular from one year. Some times this is severe and sometimes no symptoms. Especially when i work hard or feel tension this is severe. Is this serious

Summarized question: Why is Vertigo caused ?