Hair Growth / Breakage

Hi, I’m Kaz, I finished my chemo and radiotherapy for breast cancer just over 2 years ago.  Since my hair has grown back it breaks and snaps all the time and hardly grows.  I am also going through the menopause, looking for any recommendations for the best shampoo to help growth and stop it snapping and thinning.  

Any advice would be greatly appreciated. Thanks in advance.

Kaz