I am a overall healthy 22 year old. For the past 3 days I have had constant episodes of my head spinning pretty bad to the point where I have to either sit or lay down for a while till it gets better. Sometimes I have nausea as well. I would get light headed before but three days ago I fell off a bike and hit my head. I do not know if it is related but since then the spinning has gotten much worse. I occurs anytime of the day and comes spontaneously. Any input would really help, I have not seen a doctor yet and was wondering if its something I should have checked since it just seems to get worse. I feel as if my head were spinning not the room and sometimes I feel pressure when the spinning comes on. I am not pregnant and overall a healthy 22 year old female. Any input would help.