CD 50?!

I had a ovarian cyst when I was young, after that every doctor I’ve seen told me to just wait it out, or that it is probably nothing. I am a total of 18 days late and when i do get my period, TMI , but I soak through a tampon in an hour and a half.

I think there is something genuinely wrong but no doctor seems to give me credibility.

What should I do?