Fever, chills, headache, fatigue, sore itchy throat, nausea, sore joints am muscles. Fever went away yesterday with tylinol. What so I have?

Probable viral. All of these symptoms are nonspecific but certainly very compatable with a viral illness that usually is self limited and will pass in 3-5 days. If symptoms persist you need to be seen as there are other, possibly more significant illnesses that could be brewing - like strep throat, etc.
Infection. I can't make a diagnosis but it sounds like a viral infection. Sore throat – gargle with warm salt water (1/2 tsp salt in 8 oz of water). Get strep test/culture if very sore. Congestion – saline nose drops or netti pot. For anti-inflammatory effect & mobilizing mucus- homemade chicken noodle soup. Hydrate- lots of water/clear broth/ add honey & a small amt. Of lemon juice to chamomile tea.. >>.