to lose 170 lbs when your start wieght is 300?

i am 5'4 about 280 or so is it possible to lost 170 lbs? my dr wants to see me at 130 for my goal wieght that seems a little extreme to me i can't even concive the idea of being 130 much less losing 170 i know that people that wiegh more then i do lose that much but can someone my size lose that much? my surgery date is june 9th right around the corner and i am kinda getting scared really scared i am having nightmares that i will go thew all of this and it's not gonna work for me is there anyone out there that it didn't work for them?? maybe i am making too much of it but this is how i am feeling right or wrong and i guess i just need a little bit of support thanks for your time

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