This whole subject, also known as “psychosomatic ailments”, is an issue for nearly everybody at some point of time. Sometimes it is a specific situation or specific circumstances that trigger a negative physical reaction, sometimes it has to do with a certain person in one’s environment. Or it is a general sort of “stress” and you cannot exactly point to what it is.
We do not recommend to tamper with the symptoms or even to stomach medical drugs to solve a problem that has its causes on the mental level. Instead you should look for the actual roots of the matter, and sometimes unexpected connections come to light.