I was on a azithromycin and wasn't feeling better on day 5. So my doctor prescribed doxycycline hyclate which made me physically ill with sharp stomach pains, nausea, acid reflux, severe heartburn, body aches and confined me to my bed for two days. I stopped the med today and called my doctor. Doctor never called back so I called the on call who tried to say something else had to be wrong with me.