I have been taking Doxycycline Hyclate 20 MG for the past 2 weeks...

I have been taking Doxycycline Hyclate 20 MG for the past 2 weeks and have only had diarrhea. They prescribed it to me for infection in my gums and I seem to be getting better....my sinuses have cleared up and my blood sugar is more under control. Maybe these doctors are prescribing this drug to people for the wrong symptoms because I feel a whole lot better today 2 weeks into the drug than the past 4 months. I'm supposed to be on it for 3 months and if all I get is diarrhea, I'm sticking to taking it.