I had minor surgery the 12th and took my first doxycycline hyclate that evening. Then the morning of the 13th I was able to go to work. I took my second does and that was all it took. My face got very pale except for rosy checks that felt feverish but I had no fever. Very disoriented, unable to focus, dizzy, like a dream state, no appetite, severe heartburn (even with just water), itchiness all over. Mostly my head though. Went right to doctor who checked me out and told me to stop it immediately. I did and went home to bed. I feel better today and am back at work but....my vision is blurry!!!! I have reading glasses that I just got about a month ago and only used them for reading and small print at work. I am sitting here at work and can't see well enough with out them to take them off.