While I was taking the dozycycline I would feel really light head...

While I was taking the dozycycline I would feel really light headed experienced quite a bit of nausea. I am also a college student and when I would take it in the morning I noticed that it would be harder for me to see the board in my moring class. I had been sitting in the same set all semester, but once I started to take doxycycline, I noticed I had more blurred vision. I took It for about 2 and a half weeks. About a week or so after I noticed that my nipples were really sore... and I know this is not due to a pregnacy. Is there anyone who experienced these same symptoms?