sinusitis
"Was prescribed this for URI/Sinus infection.  Took a total of 2.5 days then experienced extreme anxiety but not the 'heart pounding out of your chest, can't breathe, think I'm going to die' kind of anxiety, but the I'M LOSING MY MIND, CAN'T TELL REALITY FROM REALITY, WANT TO CURL UP IN CORNER & DIE kind of anxiety.  Went to ER, given shot to calm me down.  TERRIBLE medicine, side effect, you couldn't pay me to take again."