I need some advice/help from people that know how to handle this situation because I don't and I am terribly afraid of it:

First of all I feel like a traitor asking you girls/guys for help since I am not even part of the sub here, but I hope that's ok. Plus for anyone that doesn't want to read the whole context to the question (understandably) just skip over the following paragraph I am sorry if its lengthy.

I am ending my last year of High School this Summer, we'll to be exact in a few days. To celebrate this it common in Switzerland (we're I'm from) to go on a trip abroad, get drunk and do stupid stuff, since its the last time you'll see most of these people. Maybe you can already tell what this is about... So, just to give some context:  I have had anxiety for a few years and its been really bad at the beginning, couldn't really go to school or anywhere. Had panic attacks and vomited in most stressful situations regarding the public and places I couldn't handle. Its gotten a LOT better and I am genuinely thankful. I am aware there is still a lot of things I cant do or have a hard time doing. Anything getting away from my regular daily schedule is very worrying to me, especially going places where I cant retreat and don't have a accessible toilet. Most of my symptoms have changed since my anxiety went down and I almost never vomit anymore. But I developed spoilers its really gross... diarrhea when I am stressed. I get really bad cramps etc and there seems no way to handle it, and I've tried all the common stuff (not talking about meds) and it has no effect. I still have it multiple times a week and its generally the only thing holding me back atm. I cant go anywhere where unless there is an ideal toilette, also one that I cant be heard. So sometimes doing things after school are a huge worry. But its a huge improvement over having to vomit just on the way to school. I just have to be comfortable with a place and kind of know my surroundings for my stress to go down and for me not to worry as much. I am not sure if i would also have returning symptoms like vomiting when going on this school trip because I haven't faced such a stressful situation in a long time.

So my Class is going on a school trip to celebrate. I have anxiety and also panic attacks, but haven't had one in half a year. I am very very scared of anxiety/panic attacks during the trip. My symptoms atm include nausea and diarrhea I will be sharing a room with a close friend of mine and generally there will be no structure throughout those 4 days. I am terrified of the toilet situation in the hotel (sharing with my friend) and also just leaving the hotel because I don't know what it will be like wherever we go (toilet and retreat situation if I need it) and I don't know when ill have a lot of anxiety/ potentially a panic attack. I haven't had to face this issue due to corona. I don't have meds for anxiety because my parents are against medication which I've come to terms with ( I have out of date Xanax from a few years back). I thought it was important mentioning I do do things with my friends we even went to a theme park, but it was during a very calm school day which made it easy for me, none the less sometimes I can handle it very well but just a few hours at a time. I am generally very thankful of anyone with tips and tricks that knows how such a situation can be handled for the 4 days.