I've had an em cs and planned cs.
Let the theatre staff know if you are nervous. Mine talked me through my prep for my planned cs and the midwife held my hand [hand].
Try not to eat too much the day before as you might get constipated after the op. They usually give you a morphine suppository afterwards, which obviously you won't feel as the spinal block will be working!
I was sick a few hours after my cs's, I think its something to do with the mixture of spinal block / morphine / painkillers. Only lasted a little while, although it wasn't nice.
I never had a problem with the catheter, after several months of constant pee-ing at night it was a welcome relief to not have to go to the loo for 24 hours. You will probably barely notice it. I felt only a brief stinging sensation when it came out.
Don't wait for pain to get painkillers, keep on top of it. And get the midwives to write down when you should take them once you get home, ie: something like 8am, 10am, 2pm and so on, stick to the same regime as hospital.
Primark do high waisted stomach control pants for about £4 IIRC, pack of one black and one flesh coloured pair. They're not tight like spanx, just high enough to not rub your scar. I had a pack of the mesh carriwell hospital pants too.
Herbal teas and light food are good after the op while your stomach and body settle down.
Take it easy at home for as long as you can, especially the first couple of weeks. Gentle pottering and peace and quiet are good.
If its any consolation I was back at the gym 12 weeks after both my cs's and felt fine by that point.
All the best.