I first went to my GP with symptoms when I was 13, shortly after my first period. I was in severe pain, unable to move, passing out and vomiting. My GP told me it was normal for my age to have period pain and I was probably underweight and "should try eating more cheese and apples".
I'm 27 now with the same symptoms with more added over the years. After such a long time being told it was normal or "it just happens to girls" i'm only now able to accept that it's not normal and i'm trying my best to get a diagnosis.