I went through a period of my life sometime around the age of 40 where I would have those. They were awful. The worst part was the fear of having one, which actually caused them at times. I read a book by Edmund Bourne called "The Anxiety and Phobia Workbook" that helped me immensely. It took a long time to work my way through it, but now it has been decades since I experienced one. Whew.