10yrs later and have had enough

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hi everyone im new here.
Hi my name is Maryska, im from South Africa. 10 yrs ago, at weight 45, i fell pregnant, and didn't lose the weight, then 2 yrs later i got preg again, and gained about 20 kgs, i lost a few kilos, but not much, 3 years i got pregnant again, and gained about 15 more kilos, i lost some, and then in 2010 i got preg again and gained, after that pregnancy i weighed 85 kg's!!!
Anyway so now 13 months (last month) later i weighed 79. and now at 14 months 14 months post preg, and 3 weeks after starting my diet, im down to 75kg's. I seem to have hit a plataeu. I just cant seem to get lower then 75kg's, ive been stuck on 75 for the last week!!!! im so frustrated.

I started the lipolytic diet, aka, HCG. i have to inject my myself every morning. and have to eat a 500 calorie regime every day!

height: 1,56m
sw:79 kg's
cw: 75 75 kg's
gw: 60 kg's

I'm hoping to get some support and advice through this difficult stage of my journey