I've stopped losing weight and want to give up

Hi everyone

I posted last week explaining how I have been stuck on the same weight for awhile now, despite only consuming 1200 calories a day, weighing my food, tracking my macros and calorie consumption religiously and training 5/6 days a week (strength and cardio)

This week my weight is still the same, sometimes going up throughout the day.

What am I doing wrong? I'm feeling really disheartened as my friend has hit the 3 stone lost mark and consumes more than me and still eats junk food often (I don't even give myself a cheat day) and her weight is sliding off.

Fed up at this point and ready to pack it in so any advice on how to lose weight again would be very much appreciated. My trainer advised me to take Ph balancing drinks and water retention pills and they aren't working :(