I had dental implant surgery. I took clindamyacin as a prophylactic. I finished the RX 3 days ago and still feel fatigued. How long does this last or is it from the surgery. I had severe gerd during the course of the med and had to take ranitidine. My surgical site is in good conditiion though my jaw joint is a little sore when I open my mouth wide. I have headaches too. My main concern is the fatigue.