I have always had a lose stomach , Whenever something stressfull or diffrent comes up i end up in toilet with diarrhoea

Now i have to travel this weekend , Just the thought of it makes my stomach cramp

I had a stomach infection a month back which has set off my IBS

Stool test was done , Gastro told it is irritable bowel

How to control stress and calm my stomach when i need to travel

Please help