Kitty yes, totally normal for night hot flashes. Gotta love those hormones.
Frus I would see if you can speak to your midwife about the post-cath pain. She might have some suggestions about ways to help it feel better.
Oh jo. I so understand the over-doing it days and then not being able to function the next. 
. For what it's worth, I've seen mums be very achy (one mum even had a cracked spinal vertebrae that no one had diagnosed until after the baby was born, good lord I don't know how she functioned in those last pregnancy days) but they've gone on to be completely pain-free in between ctx and not notice anything extra during the ctx either. Just try to rest up today, lady. Pamper yourself today. Nice hot shower or bath, DH-massages, and lots of rest!! Sounds like something is trying to start up again. Keep us posted!
I was just thinking this morning about the differences in end-stages of pregnancy have been for each of these kids and it's really crazy how much it changes. #1 I loved being pregnant. I wasn't really overly fussed about when he came out, I just loved it so much. He could have stayed in until 42 weeks as far as I was concerned. #2 I was sure was going to go to 40 weeks as well so I was super surprised when he decided to come out at 38+2 and now I'm past the point where #2's labor started and I'm just so done and fed up. 39 weeks tmrw and my midwife brain is fighting with my actual-pregnant-woman brain about why I should be patient, don't try to do anything myself, it's up to the baby as to when they're ready, bla, bla, bla. It's just like a running commentary in my head these days. Annnnny time now would be fantastic.