You poor thing! That sounds terrible. I'm 34 weeks and was feeling sorry for myself until I read your post. I've got really bad hip pain too, so I can sympathise with you there and also with the other kids making it a bit harder when your not at your best - Ive got 6 under 10.
As for the weeing, that hasnt happened to me so far, but then again I havent got the flu either.
Make yourself a cup of tea, put the kids to bed early and put your feet up. We're here if you need us. Can you take a multivitamin?