Flu, then cold: extremely sore throat, headache, sore neck and jaw/ear pain

About a week ago I came down with a flu bug that lasted 2 1/2 days. I had vomiting, fever & chills, sore leg muscles and then it ended with a sore throat for only 1 day. I was surprised at how fast I recovered since when I get sick I usually stay sick for a while, but I was better so I didn't question it.
Then about 3 days ago I came down with a sore throat again. For one day I had a slight fever and sore muscles, general weakness, etc; That ended and for the last couple of days I've just had an EXTREMELY sore throat with a headache and very sore neck muscles.
I was taking Naproxen and some Neocitron with acetaminophen in it. Just yesterday I noticed that I now have a slight red rash on my stomach, chest, and behind my neck. Also now my sore throat has gone down a bit but I know have a pain in the left side of my jaw when I chew or swallow, it feels like the pain is going up towards my left ear. There is a little bit of uncomfort in my right ear also but no jaw pain on that side.
I don't know what the rash has to do with it. I realized I was taking too much Naproxen (4 pills daily) and I might have been taking too much Neocitron too (3-4 packets daily), so perhaps the rash is just a side effect of that.
All I know is that I've never had a pain like this in my jaw before. I'm wondering what I should do or if I should visit the doc.