Hey Sue,
I'm sorry that you're depressed..

If it helps, depression is fairly natural after being diagnosed with fibromyalgia.. After all, when a doctor tells you that you are probably going to be sick for the rest of your life, it's not the most exciting or happy news..
Have your doctors ever put you on anything to help treat your digestive disorders? I know there are a few decent drugs on the market, but you might have to go to a gastroenterologist to get real help..
As for calcium, it didn't help me sleep any better either.. A fairly gentle (and non-prescription) medication that I take to help me sleep is benadryl - just the regular pink kapseals.. I'm not sure if that would be too hard on your tummy or not, but it might be worth a try.. I take one about 3 hours before bedtime, another about an hour before bedtime & I usually sleep like a baby..
I know a lot of anti-inflammatories are very evil on the stomach, so I'm not sure what you will or won't be able to take either.. It'll probably be a long process of trial and error, unfortunately..
Anyway, I hope your grief is short lived and that you start feeling emotionally better soon..
Take Care,
Melanie