I really feel for you, without having blood tests its really difficult to find, determine and treat if possible the cause of your hair loss. Its sounds like you have considered and ruled out the most common reasons but the contraceptive pill is a major contributor to hair loss in lots of cases, could this be something to ask your doctor about? ...More >
Please see some documents above that will offer some tips and advice. I do also suggest considering a supplement.
Really good luck and please come back to us if you require further support.