I started taking doxy for my acne but developed severe headaches ...

I started taking doxy for my acne but developed severe headaches about a week into treatment. At first, I thought it was because I was pretty stressed with college and not sleeping much but I noticed I would get a headache at about the same time after taking doxy everyday and now think I can't sleep because of it. I also wake up with tightness in my chest (couldn't sleep one night because it was so bad), I'm constantly dizzy, and just have the headache feeling that one gets when hungover. I'm so angry that these symptoms aren't in the side effects because I was blaming these symptoms on other things and would have stopped taking it earlier if I knew...I just hope that I get back to normal and don't have any permanent damage to my brain.