I ve been getting headaches consistently since Oct. 22 and on Nov. 13, I woke up with the most intense headache I ve ever had, I tried to get a glass of water but my vision became blurry and everything seemed to be moving. I went to the doctor and received and MRI but they couldn t find anything. Since then, the headaches are still there but not as bad as the ones I had Nov. 13-15 and my vision continues to blur, I become light-headed, sometimes feel like I m going to faint, etc. Any idea as to what I could possibly have?