Oh my....... I have found people with the same symptoms, I feel normal now. I have been in and out of the hospital taking many different antibiotics. It started with strep throat, so they gave me erythromycin, and it lead me to pneumonia, and a big drop in my oxygen levels. They ended up admitting me and had me on a ventilator overnight, they gave me intense antibiotics of Clindamycin, which helped me somewhat, I now am out of the hospital and they switched me to Doxycycline for bronchitis, and Iv'e been having major hormone problems, heartburn, dizziness, hot flashes, I feel like I am out of my own body. I looked up on web md the side effects of this medication and none of these are included, then I came upon this site, and most of you are experiencing the same thing that I am.