Same here. Thought I had a cold, got better. 3-4 days later, felt worse. That'd last 3-4 days, got better, then 3-4 more days of feeling lousy. Finally saw my doc after a month of that yesterday.
Sinus infection. Well, at least that explains it. My employees prolly think I just take an extra day after the weekend, but dayum...felt like complete crap this weekend.
Meds and juice....