I've been feeling sick lately and not sure what I have...?

For the first few days I had a headache, sore throat and congested nose. Then my tongue started furry and white (but not anything bright or splotchy like thrush) and I had these odd bald patches. My sore throat got worse, and when I looked at my throat in a mirror I could see a big yellow sore in the back. I still have headaches and experienced minor aches. I don't think I have strep, because there are no red dots on the back of my throat. If so, what do I have?