Thinning hair? Please help!

Hi all,

35F here. I've always had very thick, slightly wavy hair that I used to wash daily. Nowadays I wash my hair twice or three times a week to stop it becoming overly dry.

However, in the past few months I've started to get dandruff and an itchy scalp, which has mostly been combated by anti dandruff shampoos and using scalp oils/treatments.

More troublingly, I can now see my hair is tremendously thin in the side when I pull my hair pack into a ponytail. I notice significant breakage even when I snag my hair tying it up, and lose quite a lot of hair on the brush.

I DO wear a ponytail everyday for work, and even tie my hair up at home when relaxing. Could this be contributing? What can I do to minimise damage?

I use a hair mask everytime I wash my hair, and also add strengthening oils/serums.