I know how frustrating and hopeless it can feel at times when searching for answers and help and they don't seem to come. But I do believe there IS hope for you.
I will offer a few practical suggestions and you can take or leave em. :0) First off, if it is RA, there is a member here who has recently posted about some natural products that have done wonders for her. The products are called bio-sil and supercissus along with malic acid. Scroll down to check out the thread by Nanamonster.
Also, you said you have tried the natural route. Many times it takes years to find the right supplements on our own. There is a lot of figuring out what works for you and what doesn't. My journey has been ten years, and over this period I've found a few great things to help, and I am still learning.
Also, have you tried seeing a naturopathic doctor? That way you wouldn't have the same guesswork involved regarding what supplements/diet would work best for you. I have heard many stories of people greatly improving from fibro. from both using natural approaches and/or through the care of a naturopathic doctor.
Sometimes we just get tired in this journey, and it sounds like you have a reason to be as you've seen a lot of doctors and nothing seems to be making sense. BUt please don't give up. I know sometimes it seems it takes so long to access the help and resources we need, but there is a time for everything, and if we hang in there, at some point we can usually expect the help to arrive...
Also there are several members here who have found things to help them and I'm sure they will have lots of great suggestions for you. Way to go on reaching out and finding the courage to post!