Bowel movements are commonly altered after surgery. If you received even one dose of antibiotics, you may develop several days of diarrhea after surgery.
Diarrhea associated with antibiotic use, is a watery diarrhea, that usually, appears from 1-2 days after the start of antibiotic treatment to several weeks after stopping of treatment (often stops on its own in 2-14 days after antibiotic withdrawal).
You may experience left lower abdominal pain or abdominal cramps.
Probiotics should be helpful in subsiding this symptom.
Diarrhea that is getting worse over time and is accompanied with fever, warrants medical attention.
Some patients may have pain at the incisional site up to a year or longer following the surgery, due to a nerve injury or irritation.

Consult your surgeon for the pain!