Can stress lead to permanent hair loss. I am a man and lost a lot of weight in a short time and have chronic stress and insomnia, and now hair loss.?

YES. Yes on multiple levels. Stress has a huge impact on the body including hormones. But weight loss also has an impact due to vitamin and mineral issues. Check with your pcp make sure vitamin and mineral status is alright. Work on stress with exercise. Genetics also do play a role in male hair loss.