Too anxious to go to an interview

I don't know what to do. I was supposed to interview for a really good position today and had an anxiety attack in the parking lot and couldn't do it. I started hyperventilating, couldn't move and started crying. I feel like a huge failure. I have another good interview next week and I'm terrified I'm going to mess it up. I'm currently a stay at home mom and my husband works but things haven't been great lately and we could really use the extra income. Any advice?