What could cause persistent headaches and fatigue after a fever?

Hello doctor,

I am a 22-year-old woman and am not on any medications except some Ibuprofen to get rid of a persistent headache. I have been feeling bad for more than a month now with no signs of a full recovery anytime soon. It started with simple fatigue, which I found odd. That developed into mild cold-type symptoms for the next 3 days (an occasional cough and a bit of a runny nose). By this month's start, I suddenly became extremely fatigued, and that same night, I got a horrible fever. That disappeared the next day, but I remained bed-bound until the weekend. After 3 to 4 days, I felt strong enough to leave the bed and do a few things, but since then, since then I have had daily headaches that come and go, forehead pain, an ever-increasing blocked nose, insomnia, and cough. Is this sinusitis, and if so, does it sound viral or bacterial? Do you recommend seeking antibiotics? Please suggest.

Thank you.