What do you mean eating a lot more protein in your diet? Do you mean those protein shakes or lean red meat or chicken or plant based soy or beans?
How do you know you had Candida? I know a friend who had hair loss too. He found out that It was a fungus that was causing his hair to grow thin. Once he killed the fungus his hair grew very thick with no patches.
Health complications and stress can also make you lose your hair. You could also consider environmental factors. If you drink from tap water you could get a water filter. I'm just pointing out that example because it's one of the problems I'm dealing with now.... Very bad water.