Do I control my emotions ??

For my whole life, I have thought I control my emotions and the way I feel. And my boyfriend say I’m over emotional sometimes. When I was complaining about food and wanting sweets and I told him I’m on my period. Then he said “ohhh that’s why your so emotional and moody”. Yesterday looking back on when was upset at him. I realized I was over emotional. Can my period really cause me to be over emotional and moody ? Or alter my emotions in some way ? I was a strong believer that pms didn’t exist until I realized the patterns I went through on my period. Especially when my boyfriend does little things and I overreact. Or when I whine a lot and act like a brat when he’s gone lol. I’m confused lol. Help ?