Hair thinning from taking Letrozole

Hi. I've been taking Femara now for nearly 8 years. The side effect I'm having the most problems with is hair thinning. My hair was fine anyway before Chemo and radio therapy 8 years ago, but it's got very fine now, especially on the front of my scalp. My hairdresser doesn't seem to know what to do. Can anyone recommend a hair product to make my hair feel and look thicker? Thanks PatK