My toenails were quite slow to recover and it was years later that I realised I might have had some fungal problem on top of the discolouration and splitting. You might want to get some advice on what’s what. Chances are it’s just a slow process. I have been on Letrozole (Femara) for over nine years - I do have some side effects but nothing that stopped me working. Joint pain and menopausal type symptoms are quite common, but I didn’t have any of those. Those who have experienced those side effects sometimes find they abate after the initial months. A bit like chemo really, very different side effects often and you don’t know till you start. Best wishes.
