Emotions when pumping

I get so agitated when I am pumping. Something comes over me, I get angry? Frustrated . I can not describe how it makes me feel. Like whatever I am doing, bothers me. I get frustrated with my SO when I’m pumping. Does anyone know what this is???? I’ve been trying ignore it but ugh it gets to me. I don’t feel like myself if that makes any sense . I am super happy that I am producing milk but idk what this feeling is .