What is going on here? Health Question!?

Anonymous
I have scowered the internet looking for this, so I'm hoping someone on here will miraculously know. Two weeks ago, I was out running in the woods and got cut, bit, or something. A couple days later, I had what looked like a zit or a blister on my ankle. I ignored it thinking it was just a bug bite. A co-worker even said it was just a fire ant bite and would go away, other people said it looked like a spider bite. It swelled all up, around the sixth day, and by the eighth, it had turned black. Still avoiding going to the doctor (money), I was out trying to keep things normal when I suddenly got this horrible headache. I'd been getting headaches for a few days, but they were also at night. This one was the strongest and in the middle of the afternoon. I made my excuses and headed home. By the time I walked through the door, I was freezing so badly I had to take a hot shower just to stop shaking, I was very nauseous, my head was throbbing, and my eyes felt practically swollen shut. My fever was around 102. I was so sick, and this is a first, that I was up most the night. Usually, I can sleep through anything.

The next morning, I got up and went right to Urgent Care. The doctor came in, asked about a couple symptoms, poked at my ankle a bit, and promptly said I had a Staph infection. He pretty much cut it out, as in I now have a giant hole in my ankle, and put me on antibiotics. This was nearly three days ago. So, here's my question. I feel a lot better, though I still struggle to walk, but at nights, the headache, nausea, and chills come back along with a slight fever. Can a doctor really make such a diagnosis without running tests? How long will it take these meds to work? What can I expect from here?
What is going on here? Health Question!?
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