I've officially lost my confidence, what happened to me like this?

Hey girls, lately I've been feeling this never-ending unease inside me. I used to be really confident, but now I literally can't recognize myself when I look in the mirror. My boyfriend constantly criticizes my every move; if I say something, he immediately says I'm exaggerating. I've started to doubt myself. I'm always anxious; it feels like my heart is being squeezed as if something is wrong, but I can't put my finger on it. I'm wondering if I should go to therapy to get rid of this situation or if I'm just going through a phase, I really don't know. Is there anyone else who feels this way?