Travel/Bathroom Anxiety

Hey all, was wondering if anyone has any advice.

My anxiety is based on needing to go #2 whilst travelling or when in queues.

When I get in that headspace, all I can think about is how much my stomach hurts and how much I need the toilet, to the point of my body getting really hot and I begin to sweat.

Now I have a flight next month, this is something I do multiple times every year but last time I needed to pull over multiple times to poo - ending up with having diarrhea on the side of the road and my father pressuring me to hurry or I could miss my flight.

I have tried Imodium, which can work, and also buying a fast track to get through security quicker, but the drive to the airport is always the hardest and since last trip, all I can think about is how much I will need the toilet.

Is this similar to other peoples situations? If so, do you have any tips to make it less stressful/more manageable?