1. Everyone is different but in my experience, sorry to say: yes.
2. We're all unique, but as for me, some days I feel fabulous. Some days I have awful! Many days I have a baseline of having some symptoms of spondylitis.
3. I don't.
4. I'll let others who know about this answer.
5. There is a wonderful set of exercises here that Cindy has, let me try to find it. But if you like to do yoga, pilates, and swimming in heated water, all those things are great as long as you listen to your own body and go at your own pace. If you go on SAA you can get a list of rheumatologists who specialize in AS:
http://www.spondylitis.org/
If you get special inserts made just for you, this may help with your plantar fascitis pain. Did I spell that right? I wear Sanita clogs all the time, because they help with that a lot for me. There are special stretches that help with plantar fascitis:
http://www.heel-that-pain.com/plantar_fasciitis/exercise/plantar_fasciitis_exercise.php
6. Diet. Lots of information here. A special section for people following the no or low starch diet. Carol Sinclair wrote a book about this which is very helpful and easy to understand. The IBS Low Starch Diet is the title. Don't worry if you don't have IBS, it still applies.
Dr Ebringer:
http://www.youtube.com/watch?v=ZFFmqH66ORM
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Congratulations on your new baby!! I'm sorry you have to deal with AS, but hopefully you'll get the care that works for you, the treatment that meets your needs, and find that stretching and other exercise make a big difference.
Best wishes,

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Jan