You may be serum iron deficient.
First indication is widening of the parting
Many heart medications cause hair loss as well

Have you had your thyroid checked?

Ask your dr before taking, but
I found that using Biotin helped mine shed noticeably less. Not completely but enough. (Everyone different ) Have to be patient as it doesn’t work overnight. I think I noticed it on my 2nd month? Can’t remember.
Hope it helps.

My hair has been falling out for long time. I pull wads out of the brush each week. It grows back but it very thin now.