Why hair falling out and nails breaking before diagnosis?

I was recently diagnosed with CLL. I haven't had any treatment yet. However, in the last year or so, my hair has been thinning out a lot. My baseball hat is too big now. Is it possible that my hair is so thin? (I hope my head isn't shrinking! :))

I haven't been treated yet but have been losing hair, breaking nails, night sweats, fatigue for over a year. I keep reading that the treatments cause hair loss but I haven't had any treatment.

Thanks