I lost 1 lb every first 3 days I started calorie counting (I was 140 lb 5”4 with 1,100 cal/day), it is most likely water weight, but still makes me feel good. Did you exercise? Watch out for salty food as well, so you will not retain any water.
Good luck and I know how you feel, I am one of those who weight myself 2 times a day and expecting to get slimmer with every breath I take