5 week post-op

im 5 weeks post-op today and have only lost 17lbs. I was down 15 lbs at 2 weeks post-op, at 2.5 weeks i had to get IV fluids which made me gain 5 lbs. i keep looking at everyones weightloss that had surgery after me and most have lost way more than me. Im tracking my protein, carbs and calories trying to keep it around 500-600 cals, 60 protein and under 30 carbs. i know I'm a slow loser but to see my scale only move .4 in a week and I hardly eat anything just makes me want to cry.

Im having problems when i first get to work, the past 3 days i damn near past out while dealing cards and have to go sit down for a 10 mins and then im fine. not sure whats causing this my mom thinks low blood suger. TMI- Im also having problems with BMs Im lucky to go once a week and then its not much that comes out. Ive tryed maralax doesnt help, 4 days of exlax in a row never went.