A trip to the OBGYN what to expect?

Angelyn
I ended up in the ER because I've been on my period for almost three weeks now, pregnancy test came back negative and they said that I'd have to see my OBGYN because I probably have fibroids 
My appointment is Friday and I'm honestly petrified. I'm only 17/have heard that it's rare to get fibroids this young and I've heard that if you have bad fibroids you may end up needing a hestorectomy. What should I expect? 😕