Overreacting?

Since I've had my son I've become so sensitive. And I overreact to everything. And this week have been so rough and it's only Tuesday. And today my s/o and i went to the store to grab a few things and the cashier decide to insult me to my face. She told me I should comb my hair. And told him I guess he really love you to accept the way you look. Since I had my son i haven't had the energy to dress up or look pretty. I was so bothered by the harsh comment I called to call her customer service number. I want to ball up and cry i was so embarrassed and humiliated.

Was I overreacting?