Anyone who has IBS, when were you diagnosed?

For the two month I have been struggling with bowel issues. I have had constipation, diarrhea and abdominal cramping on and off constantly!! The past 2 weeks the abdominal cramping and urgency to go to the bathroom have been bad. I had a colonoscopy exactly 2 years ago that came back normal. My mom and sister both have IBS, my mom was diagnoses when she was my age, 28. I have an appointment with my doctor next week, but just wondering what everyone else’s experiences with IBS was?