Even with those symptoms it very well could be the flu. I have the same thing and did the whole I feel better one day then the next I am feverish and icky again. Yesterday, after one week of this, I finally had a good day and today seems to be on track as well. The best thing that has helped so far is drinking about a gallon of water a day. It keeps the mucus thinned out and keeps me hydrated after all the fevers. I also take 2000 mg of C three times a day and lots of vitamin D (up to 4000 IU daily). Hot tea, hot chicken noodle soup or any kind of broth based soup will make your throat feel a bit better and the steam from it will soothe your sinuses temporarily. Get lots of rest even if you have to knock yourself out with Benadryl (which works great). Steamy showers also feel good if this crap has hit your lungs.
I travel a lot and use lots of precautions to keep germs at bay (vitamins, hand sanitizer, not touching my face, Sambucol if I feel something coming on) and I rarely if ever, get sick. However, there are times when it just doesn't matter what you do.
I hope you get to feeling better soon!
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