Wow, where to start! Anxiety (and depression too) often occur along with GI problems. There are serotonin receptors in the gut just as there are in the brain. You can google "gut brain connection" and find plenty of information about it.

I don't understand why your GI problems aren't getting treated. I do understand why they have to look for a diagnosis up to a point, but if they don't find one and you have anxiety problems, surely they will treat the symptoms?

I had GI problems in my late teens, really even before I was having anything more periodic anxiety problems. It's not a new problem.

As to the "that's in the past so it doesn't matter any more".......just wow.

It does sound like you need a different therapist. Even if you don't really want to go to therapy, if you have a therapist you can trust, you can look at it as an opportunity for personal growth.

Hugs.