Gyno thinks something’s wrong with me

Me

I’m 16 and I went to the gyno cause I thought I had an infection but she did a full check up and I was telling her that my period lasts for 10-13 days I have bad cramps and extremely heavy bleeding ( I bleed through a super tampon in an hour) and she said that that’s not normal and recommended me to go back on birth control but I didn’t want to because it made me get a hump on my neck and really high cortisol levels and now she wants a sonogram of my ovaries cause she thinks that there’s something wrong with me. Has the same thing ever happened to anyone? My family has a history of pcos and endometriosis