Hi Midge.
The infection after any surgery can cause close-cavity infection.
It looks you have a close-cavity infection on the right side above the pelvic bone as it is throbbing.
I would suggest you to undergo urgent high resolution
ultrasonography to watch for an abscess; if present re-exploration is the best way to drain the abscess and put in a drain to avoid further complications like
septicemia and
bacteremia.
The burning pain is again suggestive of an active inflammatory process.
Go for . Blood- complete blood picture,
kidney functions tests, blood sugar fasting and post-lunch,
Urine- routine,microscopy, culture and sensitivity ( before the change of antibiotic).
This will certainly help you to recovering faster and completely.
Pus culture and sensitivity has to be insisted upon.