I had urge incontinence a year after my radiation due to mild radiation proctitis. I took Myrbetriq to relax my (involuntary) detrusor muscle help me get it under control, and it took about 5 months before I was confident dispensing with the pads.

For the fecal incontinence (which I didn't experience), you could also try adding some dietary constipants to your diet, like yogurt, rice, bananas, and kefir. When I experienced severe diarrhea during an aid deployment to Africa 10 years ago, it was eating lots of plain, unsweetened yoghurt that started my recovery.