@deakinoh, I also had thinning hair after my transplant, and took biotin after talking to the dermatologist during my return to Rochester for my 1st follow-up appointment at Mayo. My hair dresser also recommended using a gently shampoo and conditioner that she supplied for her cancer patients. So in addition to the gently combing and brushing, that is something that you might want to consider.
I also had damaged fingernails after transplant. They had turned paper thin beforehand and they grew out afterwards. So I had old ones growing out, and new ones coming in. The doctor also said biotin is good for nails.

Have you noticed a change in your hair texture?