Elizabeth, exercize is great for Fibromialgia and AS, it does help a lot. Check out those sites.
What kinds of foods are you eating? Animal fat, red meats, dairy and sugar I know are really bad, notice if you feel more pain after eating these things. I try to eat about 80% fruits and veggies. Take a couple of tblspns of flax oil a day. I drink a frozen berry smoothy every morning with vitamineral greens, nutritional yeast, whey protien, tart cherry juice concentrate and flax oil, I add water instead of juice in order to keep the sugar content down and I sweeten it with liquid stevia. This is highly nutrishous food that is good for your brain and high in antioxidants. I am still experimenting with the suppliments the above sites have good suggestions.
Good luck