Talk to Dermatologist on Hair Thinning Hair Fall White Hairs

“I am female and experiencing significant hair fall from the roots and progressive hair thinning. My middle part has become noticeably wider and my scalp is visible. My hair has also become very frizzy, and I am getting more white/grey hairs than before. I wear a hijab and undercap daily for office. Please advise what could be causing these problems, which blood tests I should get, and whether minoxidil or any other treatment would be appropriate for me.”