vitamin d deficiency
"After a routine blood test for a physical it was discovered that I had a vitamin D deficiency. My Dr recommended ergocalciferol 50,000 IU capsules once a week for 12 weeks. Around 6 hours after I took that first dose I woke up confused and weak, it was the worse  day of my life. My personality changed completely, I thought I was going crazy. I cried, I was screaming, I couldn't even stand up from my bed. At some point I passed out for a short period and  when I finally opened my eyes everything was spinning. My husband rushed me to the hospital, and after a few tests and a CT scan it was determined that I had a really bad adverse reaction to the vitamin D. They gave me fluids and I guess that's what helped me to recover."