Hi, I Have Just Finished Taking A 10 Day Dose

Hi, I have just finished taking a 10 day dose of Doxycycline Hyclate 2x daily, for large infected blisters on the inside of both heels. One has healed, but the other is still painful when I walk. I also have other blisters forming on both big toes and other toes and on my fingers. I pierce and empty them multiple times daily. The other problem is that I am in Florida while I was taking the RX, I wore loads of sunscreen, however I have severely burned my feet, fingers, chest and face, including my lips. I was wondering how long the drug stays in my system, and what I can do about all this?