I lost all my hair in just 2 1/2 weeks at the time my hair was dark brown two months later it grew back pure white all my facials hair which never fell out also turned pure white . The hair on my legs fell out and grew back pure white the rest of my body hair stayed normal .Is this alpecia or could this be something else .I have had 4 back surgerys and one open heart surgery could this be part of the problem?