hi linda, your abdominal pain
may be due to nerve
compression or irritation near the previous operative site. Taking lot of pain killers can also cause acidity and abdominal pain. Better consult your surgeon whether the current pain is due to either of the above. Sometimes, nerves to the bladder can also be involved, leading to what is called 'neurogenic bladder'. A urology consult will help to know whether there is bladder outlet obstruction
or whether you are holding urine in your bladder even after voiding (residual urine). A few tests like sonography
can help. Good luck.