I don't know if a dietician would be useful for IBS.

I am a DIY type and have for many years been health food focused. When it comes to my IBS-C. I finally got relief when I discovered the Monash University food app for FODMAPs and did a lot of Googling on IBS and FODMAPs.

Try to find an appropriate dietician if you are curious and go to one appointment to see if it has value.

Also, remember, stress can play a part. There is an app called Mahana. The first segment is extensive, useful, and free. My gastro recommended it and it was put together by a doctor. Very useful.

It is a journey. Regardless, experiment in some way and keep at it until you find what works for you.