Debbie,
Along with the regular depression that comes from realizing you have a chronic disease you may have something else going on. If you have fibro there is a good possibility that you also suffer from Seasonal Affected Disorder (S.A.D.). It's very common in fibros and people of northern european ancestry. My doc diagnosed me in the fall one year. She said, "Do you just want to have a bowl of macaroni and cheese and go to bed?" I was floored because that's exactly how I felt!!! She understood the symptoms very well because she has it, also. Happens when the sunlight levels decrease in the fall.
If you can't move to a sunnier climate to fix your mood you can add more light to your life. I got a broad spectrum Happy Lite (from Verilux, I think) on eBay and keep it in my bakery when I'm working or in my kitchen when I'm doing family stuff. Regular light bulbs don't fix this problem but the bulbs that they use to grow plants are the ones you need. She started me out on 4 hours a day and my energy and mood did a complete turn around within a week. I even use the light during my summer busy cake season because I so seldom get outside in the summer.
Also, from my "Welcome" post: Don't be surprised if you go through a period of mourning before you finally get a handle on this disease. There is a grieving process involved with accepting a chronic illness and the loss of normalcy in your life. It takes time to go through the grief process before we finally get to the point of accepting and living with our diabetes. There is a
website about coping with a new health concern that I found especially helpful. If you click on that link you may get some insight into your feelings. This won't make it all better but it will help you understand and see that there is a light at the end of the tunnel. It just takes time and understanding friends.
Hope this helps.