With regard to "not opening bowels for a week", I had a similar problem after my op back in 2012.
The first time was quite a challenge as I was worried that if I strained too hard the catheter would come out. I couldn't actually sit on the toilet either so I had to stoop. I laugh about this now but at the time it was quite distressing.
I found that Senna took the night before made me want to go and lactulose softened the stools to make them easier to pass. It was about 5 days after my op that I eventually went and what a relief! I filled the pan! After that I was quite regular and it became easier. I still had to stoop though until the catheter was removed, which was 10 days after op.
I hope this helps and isn't "too much information".
Wishing all the best with your recovery.