I had what you were describing for years starting age 14. Discovered cause by someone asking a doctor in newspaper. Some people are extremely sensitive to caffeine. Also, the coffee in the US is not pure like where I live now in Costa Rica. The episodes stopped when eliminating coffee and soda with caffeine. I had though last night a very short one. But I had just eaten 1/4 cup haegen daz ice cream with coffee in it. I would bet you drink coffee or other with caffeine.