Hi there, your radioimaging is not suggesting residual/ recurrence.
Nitrofurantoin is used mostly in UTI that is urinary tract infections.
I think they would have advised urine routine ,culture and sensitivity.
If your symptoms are acute ,it is most likely infection.
So, don't worry ,loose motions vomiting are quite possible after infection and are side effects of antibiotics too.
My concern is at the age of 29 ,you had a major surgery and treatment.
Are you having any family history or is your diet lacking fibre completely?
Next Steps
So, child I believe you should have healthy sexual practices. Please take a healthy diet.
Regular monitoring of your disease is extremely important.