If you are female and perimenopausal or menopausal, a decrease in hormones can cause anxiety attack symptoms. If you are male and in midlife or older, a drop in testosterone can cause the same. Other hormonal imbalances, such as a thyroid imbalance, could also cause such symptoms. You might consider consulting with the appropriate doc--gyn or endocrinologist.

Also, extremely subtle forms of bipolar disorder that don't involve mood swings or major psychological symptoms can mimic anxiety attacks. They can also suddenly increase in midlife when other physiological changes are taking place. A very savvy psychiatrist can help.

In any case, anxiety attacks are the pits and they are no joke when you are in the middle of one. It may take some sleuthing to uncover the cause of yours and the best course of action. Take them seriously. Good luck.