What causes diffuse hair loss all over your body: scalp, eyebrows, eyelashes, arms, underarms, legs, pubic hair?

What would cause this? Hair growth is slow when it is shaved. Not growing back when it falls out. Weak, brittle and thinner. Including the body hair when it grows back the condition is weaker Tsh and ft 4 tested both within range. Tsh was 2.19. Less terminal hair growth everywhere. Dr says it is not thyroid. Says hormones are ok. Some of you have said hairloss on scalp looks like fphl. So what is causing diffuse loss across the rest of body. Hairloss on body and head happened at same time.