Oh yes, Kat, I know how you feel. I was in my late 20s when I started feeling bad. There were many times I thought there must be something else going on - and sometimes, there was - that's a hard thing too, knowing when to check symptoms out and when to attribute it to "just" fibro. We have been given a tough row to hoe, no getting around it. But others have so much worse.
I hope everything goes well for you with your biopsy.
Debbie