Anxiety during the deed

So I’ve struggled with anxiety disorder for a long and I’m always very open with my boyfriend about it and he’s very supportive. During sex my anxiety often creeps up out of nowhere and I usually tell him that we need to stop for a few minutes. He lets me take my time and do breathing exercises and we don’t continue until I’m feeling better. He’ll even do the breathing exercises with me to help. I just feel bad cause I feel like it gets in the way a lot and I wish it didn’t happen all the time.