It's hard. I am hypersensitive about my gut as well. I can feel every single thing happening from entry to exit when I'm having anxiety.
The best thing I have found is to avoid my GI triggers especially if I am stressed. So avoiding certain foods that cause me problems and eating foods that feel good (my go to foods when I need to feel better are bananas, carrots, oatmeal, and yogurt, but everyone is different), avoiding stimulants like caffeine and processed sugar, avoiding medications that are hard on the stomach where possible (NSAIDs are a trigger for me), and drinking lots of water and soothing teas (ginger is my go to, chamomile is good if you like it).
The thing that always actually yields improvement for me is working on reducing the anxiety as a whole. Because it's a vicious cycle - anxiety causes gut problems, gut problems cause anxiety. Your gut and brain play off each other like bad children. So I started meditating and am taking up yoga again. For you it might be something else that helps, whether talking to the counsellor or going for walks. I also mentally tell myself when I feel gut sensations that this is all they are, sensations, and try to let them pass. And if you have to go... you go. I have an in-law who knows the location of every public washroom on their trip, just in case. Half the time they don't need it, but it's a comfort to them.
But it is hard. It takes time, and progress is slow (I remind myself every time I say this, because I get discouraged too... all the time). But slowly but surely if you can calm the anxiety the rest will follow.