Sinus Medication Solution

I’ve had a sinus infection for five days. Huge pressure, pressing on my teeth and now having ear pain – no congestion, only feels better when I take decongestants and ibuprofen. I know – go to the doctor. I’m uninsured and a starving artist, can’t afford it. I have some doxycycline left over (about 10 days worth)…will it work on my sinuses or will it just do nothing?