Panic Attacks all of a Sudden?

Had anyone else been overcome by stress? I'm due October 20, and health wise I've had no complications. This year we got engaged, married, bought a house, I lost my mom to sudden brain cancer and I work in a high-stress environment. I try to relax but it's all catching up to me and I've been having panic attacks every morning when I get to my office. I feel weak for not being able to cope, and those around me don't quite understand. Under normal circumstances would I still be reacting like this?