Help with hair?

Ali • Professional introvert. TV ninja. Evil explorer. Internet specialist. History enthusiast. Queen of everything.
So, a little bit of background: my entire life I've had SUPER thick beautiful hair, but after having to spend some time on hormones whilst TTC, I've noticed that my hair is shedding more than ever, it feels super thin, and is prone to easy breakage. This is devastating to me as my long thick hair was the part of my body I was 100% confident and proud of. 
I'm not sure where to go from here in terms of trying to repair it. I don't use any damaging products on it (no heat at all, no styling tools). I was hoping you ladies could give me some advice on things I could do to try and rejuvenate my hair. 
Thanks!