Levaquin and optometrist

I was prescribed 750mg of levaquin 9/11/07. I read all the side effects but also read in many scientific studies that the odds of these side effects occurring were slim. I believe the exact figures were around 1-3%. I have my bachelor's of science in biology and am planning to attend graduate school next year, so I thought I was educated enough in the realm of how drugs interact with the body. "1-3%" is such a low probability, right?

I took one pill at approximately 9pm then around 11pm I began to feel dizzy and light headed. I had been drinking water all day and continued to do so after taking the first dose so I decided to go to bed. I awoke the next morning still dizzy and my muscles ached. Then, while walking to the bathroom to put my contacts in, I began to hear ringing in my ears until it was all I could hear around me, I developed tunnel vision, then completely blacked out. The only way my vision returned is when I sat on the ground with my head between my knees barely moving. I remembered reading that levaquin could cause hypoglycemia so I literally crawled to the kitchen and poured a plethora of sugar into a cup of gatorade and drank it as quickly as I could. I've never been more thankful to be an athlete and keep that in my refridgerator constantly...well... I WAS an athlete. I haven't been able to walk, let alone run, without my head throbbing with each step.

It is now 9/19/07 and I still have a pounding headache that won't go away. It is as if my optic nerve is on fire. I've tried vitamins, flushing my body with constant fluid, sleep, massage, and an optometrist examination for new contact lenses in case the headaches were due to eye strain. Nothing has seemed to work. My sinus infection that the levaquin was initially prescribed for has subsided but I can only hope that this headache will subside as well.

Has anyone else experienced an on-going headache as well? And if so... what have you found provides relief?