There are some things in Fibro 101 that might help relatives and close friends understand a little better....The Spoon Theory and Doctors Respond to New York Times Article. Plus there are other links to articles that could help.
I'm sorry this happened to you. But, you learned a good lesson....not to tell your aunt anything but the weather forecast! That's really a shame but it is very hard finding people you can trust and people who know how to keep their mouths shut!
My youngest daughter, when she was a toddler, had to be the first to let people know what was going on. She'd come tearing in the house to spout out the latest gossip so we called her "Da, da, da...News Flash!" We did explain how important it is to keep other's trusts and she did learn the lesson, thank goodness. You aunt obviously didn't
Try not to let this kind of stuff get to you. You know what is going on with your body and hopefully your doctor does too. WE are here and totally understand, too. So, consider the source...it's called ignorance. They really need to learn things about life.
Sherrine