Hi MKW,
I recently had an ileostomy reversal (5 weeks post op). I guess everybody would respond to surgery differently depending on what you had taken out, disease status, how long you have had the ostomy etc. and you might have also come across all of the horror stories out there on the internet.
I was also scared pre-op reading about people going loo many times and not having control. I had most of my colon removed (the bit of your intestine that helps form stool and absorb excess water) and had ileostomy for about 8 months. Only 5 weeks post-op I feel great and glad I went ahead with the surgery as I am in my mid 20's and wanted to see if I could cope without the bag.
I have made a post with more details about my experience which you can read. Also happy to answer any questions,
Best.