If you are chronically tired and have a list of unexplainable symptoms, then it’s possible that your Vagus nerve along with the rest of the Autonomic Nervous System (ANS) is out of balance. This is generally called Dysautonomia.
It is quite prevalent in the modern high-stress, high dopamine-addiction world. There is an overwhelming sense of fatigue or irritability, headaches, or insomnia just to name a few. The disruption to the harmony of the Autonomic Nervous System lead to dis-ease or dysfunction of organ systems and even emotional state, giving you the irritable feel that you “can’t quite put your finger on”.