Post-extraction issues - URGENT

I had a tooth pulled five days ago.
I was on antibiotics leading up to the procedure.
Right before the extraction, my dentist had to drain some pus from the area.
The actual extraction went smoothly.
However, I’m still feeling some mild pain around the extraction site, and I’ve developed a headache on the right side—the same side where the tooth was.
I rarely get headaches, so the fact that this one hasn't let up for five days is making me uneasy.

Is it possible that there is still an infection present?
I'm worried about potential complications; since my head hurts, I can't help but worry about something more serious, like brain inflammation.

I don't have a fever, just the headache and that slight ache near the site. There's also a tiny bit of swelling where the tooth used to be, almost like a small bump about 2 mm wide.

Your best bet is to get in touch with the dentist who performed the extraction and walk them through your symptoms. Unfortunately, this forum isn't the place for medical advice. I'm locking this thread since we already have a dedicated discussion specifically for tooth extractions here.