I Have Psoriasis And Hasimoto's Disease And My Hair Has

I have psoriasis and hasimoto's disease and my hair has been falling out for the past year. It is so thin now - my thyroid dr says my levels are fine, My dermotoligist says that psoriasis is not the cause of my hair loss. I take biotin, vitamin e, and want to start taking pantogenic acid - what is the correct dose of the pantogenic acid? I am 5'1 and 98 lbs