I think the answer is the pituitary.
It depends, cluster A personality disorders are described as erratic and odd, cluster B as dramatic and erratic, and cluster C as anxious and fearful.
It is a diagnosis that is symptom based. There are no lab tests or other tests that can test for it.
Symptoms are usually Chronic muscle pain, moderate to severe fatigue, un-refreshing sleep, sensitivity to smells, light, noise. Headaches. There 18 trigger points that Dr's test to see if patient experiences pain.
Generally you feel like you have the flu but never get better.
Work hard and show you care about the subject you are learning about.
