So nervous I have loose stools

I’ve struggled with anxiety my whole life but recently before work I’ll have this sudden urge to relieve myself and have loose stools. It’s been so bad I’ve had to pull over on my drive to work at rest stops. I try to calm my nervousness but even if my anxiety is less I still usually have a watery bowel movement everyday before work. How do I stop this? I’m fine once I get to work