Hello and thanks for posting,

The damage chemotherapy does to your nails happens in the nail bed when they are growing, and can’t be undone, so you have to just let them grow out and let the new nails grow in. Whilst this is happening the damaged nails can split, crack or fall off. They are slow growing so all this takes time and finger nails take 4-6 months to grow out and toe nails about a year. Applying hand and cuticle cream can help.

There are some useful tips about hair thinning during treatment here,

https://breastcancernow.org/about-breast-cancer/treatment/chemotherapy/chemotherapy-side-effects/breast-cancer-and-hair-loss/#5-looking-after-your-hair-during-breast-cancer-treatment

I hope that this helps, 

Please get back to us if you need any more information or support.  You may find it helpful to talk things through with one of the nurses on our helpline.  The number to call is Freephone 0808 800 4040 and the lines are open from 9am till 5pm Monday to Friday.

Yours sincerely,

Vanda