Stopped Breast Feeding at 15 month!

Hi,
my kid is 15months old, this week only i stopped feeding her, but during day time she is quite ok, but during night time she is terrible crying a lot and makes me so sad and pitty, sometimes my mind says to give atleast, but my mother says not to give.

well i have few question you can answer Pls;

1. Does sudden stoppage of BF is harm does it affect me in future? Is it good to stop breast feeding at 15month, or we can continue?

2. I feel paining in my breasts, is there any remedy/Medicines or how can we overcome?

3 How many days it will take to stop completely, sometimes during shower when i press or squeeze, that time the milk comes out, so like to know when will the milk get completely dry?