Hey Meg,
I'm sorry that you had to join our club, but I think it's great that in just a few months you seemingly are on your way to an attitude of "living with cancer" rather than "dying with cancer." No, the type of involvement you have is most likely not curable, but it certainly can be held at bay, hopefully put into remission, and let you have a good life ahead.
While I do not have the diffuse metastasis that you are dealing with, I was diagnosed with mets to the lungs not quite a year ago. I am unable to take the anti-estrogen drugs, so I did a lot of research on natural alternatives, and was able to get myself on a regimen that worked to put my mets into remission. I think a lot of the foods, herbs and supplements I have used could be supportive to you as well. You can take a look at my blog - see how you feel about using some of these things yourself. (Please check with your dr before adding things - make sure they will not adversely interact with theArimidex, Zometa or other medications.)
http://motherearthtreasurechest.blogspot.com/2008/09/my-pers
My cancer is estrogen-receptor positive, but progesterone negative, so my regimen focuses on depleting estrogen only. You might do a web search on natural alternatives to progesterone depletion - there might be things that would be effective that aren't on my list. (My list is by no means all-inclusive on the estrogen front either - I focused on simple things that are inexpensive and easy to take.)
The exercise will stand you in good stead. Also focus on laughter and humor, mirth. Everyone can benefit greatly from 10 minutes of good belly-laughter a day, and it really can bring about very positive bio-chemical changes in the body. Also, plenty of pure, fresh water to both nourish your cells and flush away the by-products of the arimidex and zometa.
Take care,
Tre