I'm sorry. Headaches are the pits.
I wonder if you're staying adequately hydrated. Try upping your water intake and see if that helps.
The diarrhea may be from the meds. If so, I'm sure it will ease soon but another reason to make sure you're staying hydrated. Read the side effects of the meds you were recently on.
I don't believe either symptom you've mentioned is a sign of infection. I'll leave the common signs below.
If you're concerned...don't ever hesitate to call the office of your OS for reassurance.
I hope you feel better soon. Please stay in touch.
Some common signs of infection are:
Fever
Unusual or increasing pain
The incision is hot to the touch
A change in the size of the incision
A change in the odor of the discharge
A yellow or green discharge that is increasing
Redness or hardening of the surrounding area
Excessive bleeding that has soaked through the incision
@midouri