obviously worried i may not have just IBS

Hi guys,

I'll tell you my story. I am 38 years old, I lived in South America from 2012 to 2017, and then returned to Italy, my land. I have always been a delicate person of gut, a little emotional, but the problems started a few months ago, while I was back in South America (sometimes I go back there for familiar reasons): adodminal discomfort, which disappeared after defecation, both at right than left.
When I returned to Italy I was no better, my stools always changed (creamy, sometimes chopped up, etc.), but abdominal discomfort decreased after I eliminated bread and pasta.
I was visited by a gastroenterologist with abdominal palpation and intestinal ultrasound. The doctor found nothing to worry about and gave me a prebiotic treatment. For a month and a half I was much better, now I'm not good again. After 4-5 days I always have an attack of diarrhea after breakfast, even if I have already gone to the bathroom when I wake up. Faeces always change, sometimes to pieces, sometimes creamy, sometimes normal, always different.
I called the gastroenterologist again, which I hope to see this week. He says I have to feel comfortable, that I have nothing pathological, yet I would like to go back to being as good as before.
For now he says that a colonoscopy is not necessary because when he visited me he found nothing abnormal, and that I only suffer from an irritable colon.
What should I do guys? Should I accept my situation as a person suffering from irritable bowel disease and keep these annoying symptoms (morning sickness, bloating, loose stools)?
Help me