How can I lose stomach fat and get firmer thighs quickly?

I'm like 150 pounds at 4"10, I know, it's disgusting. I mean, I do hide my weight well, but I am obese and I don't feel very good in my skin because of it. My biggest problems are my stomach and thighs. How can I lose some stomach fat and get firmer thighs very quickly, like in a week or two if that's possible? I'll go to drastic measures as long as I still can eat, no matter how little. Thanks.