Losing a lot of hair and fatigue

I am a 41yr old female, i have postural orthostatic tachycardia (pots syndrome) I am losing my hair very rapidly, i have had my thyroid checked and I have been tested for lupus both negative and female baldness does not run in the family- while pots explains alot of my symptoms (fatigue, chest pain, fainting and seizures) it does not explain the massive sudden hair loss, i cant help but think they are missing something and dismissing it due to the pots. PLEASE can anyone give me some feedback? thank you