anxiety during pregnancy

Has anyone experienced anxiety/depression during their pregnancy? I was perfectly fine until recently and I'm not sure if it's all the stress because I'm getting married this weekend and have been wedding planning or what but I've been getting super depressed and all the pregnancy weight (although it's good) has been making me feel worse because nothing fits anymore. I had a full on panic attack and was hyperventilating the other day. I just don't feel like my normal super happy self. Am I the only one experiencing this or has anyone else had symptoms like this while pregnant?