Hi Jane -
I had bilateral TKR on July 18 - so I'm a little more than a month ahead of you. Like you, nausea was one of my biggest concerns - I've always gotten sick after general anesthesia, as well as with any pain meds I've tried to take. I had an epidural and it worked great as far as the nausea. It did wear of with just spotty numbness in the recovery room, so I had to take pain meds sooner than expected (if you're interested, I just started my post op thread which goes into detail of that). I did get sick from the pain meds at first, but they gave me stuff in my IV that eventually got everything under control. My body has now adjusted and I can take the pain meds (I'm on Narco) with few problems. So don't worry too much about that - the nurses will be able to figure out what works best for you rather quickly and you'll be good by the time you go home.
On a lighter note, I too was worried about my hair : ) .... From your picture, I think we have the opposite problem - I have super fine, straight hair that plasters itself against my scalp if I don't curl it... Trust me - it will cease to be a worry after you surgery ; ) ....
One thing that I did keep close by and helped a lot was my toothbrush and toothpaste. I used the "spit" container to wash it off and rinse my mouth and felt like a new person each time. This sort of makes you be thankful for the little things!!
If you have any questions, I'm here and more than happy to share my experiences!