I don't think losing 26lbs in 2 weeks is very healthy. You will end up back where you were. You gained 17 lbs in less than a month. I think you need to get a grip on your eating habits and lose the quick fix attitude. If you want to lose weight permanently the best way is to do it so you will lose 1-2 lbs per week. and while you are losing you will be gaining knowledge on how your body works and what you NEED to fuel it to suit your lifestyle.
You are on a yo-yo diet. Running isn't going to help you. You may stress your joints and bones starting off so intensely at your weight.
If you want to honestly lose weight and become healthy without quick fixes, I (and plenty of other people here) will be glad to help you.