Yes, it is possible. On a Water Fast you can lose 2-4 pounds a day. The average weight loss for women is 2.5 pounds per day. Everyone is different.
It is best not to fast if you are under stress.
Now. Please go to the mirror, I am serious, go now. Look at yourself in the mirror and say "I approve of myself, I love myself. Then start teaching yourself a more healthy way to live.
Once you have lost your weight refuse to return to wrong eating habits. The fast will help you bring your body into balance.
I am assuming that you have never fasted before...