Doxycycline Hyclate Side Effects: i have been taking doxy for a uti i took 100mg a total of 4 times http://www.medications.com/effect/view/33393 i have been taking doxy for a uti i took 100mg a total of 4 times i stopped taking it because i have been feeling horrible my stomach is tied in a knot i am exhausted my throat feels like something is constantly stuck in it i have been vomiting sweaty palms Yes, experiencing the same. I quit taking yesterday. Has yours Sun, 17 Aug 2008 20:00:53 -0400 http://www.medications.com/effect/view/33393?item=11266 Yes, experiencing the same. I quit taking yesterday. Has yours gotten any better? I am going to have to treat a sinus infection some other way.... http://www.medications.com/effect/view/33393?item=11266