Interesting that this popped up--not that you have to wear glasses but my little sister just recently got glasses about two weeks ago and she's been feeling constantly sick and dizzy as well as headaches. I was thinking of asking about that lol..well anyway, enough about my sister, I dont think that your glasses can cause that because you mentioned a low grade fever. But I do too feel kind of sick and uneasy when I have new glasses. I think you should wear your old ones until you get better though =] Because I too cannot do anything without my glasses. I'd bump into things lol. I hope you get better though!