how to accept diseases like this?

I myself have not been diagnosed but I am on the high risk side of the boat and since there is no way to avoid it I am just trying to do my best with the autoimmune disease I have.
My sister and grandmother have fibromyalgia.
I have ulcerative colitis now thinking I may have fibro.
My other grandmother is healt by but her best friend (they have been best friends since grade school, has ms.)

She doesn't know how to comfort her and I can't give her any advice for I
have a hard time accepting diseases to.
So this is a question for the both of us.
I just know about mindfulness which is really great and will help me with my other issues aswell as accepting my disease it will just take longer because you can't ignore these pains so easily.
Her friend has just been confined to a wheelchair. She is in her sixties so she is happier with the idea of "I had all that time without this much disability."
But my grandmother wants to do more for her, she wants to be there for her.
But really, ms to me sounds the scariest against fibro and ibd.
Sure fibromyalgia brings about much pain. And ulcerative colitis is no walk in the park and tends to lead to the picnic table of autoimmune diseases.
I don't know how one could take it nicely. Or how one like me who fears it as just a diagnosis.

Any advice?


-The Rice Buns