do the math, 10lbs are 35000 cals worth of deficit... if you do that in 14 days, you have a deficit of 2500 cals/day... Let's assume you create an unhealthy deficit of 1000 cals/day (putting you in the range of sub-1000 cals, since you are a girl), you still need to burn 1500 cals more...
Well reallistically speaking is VERY hard to do. You can do cardio twice per day (morning and evenings,) eat very small portions every 3 hours or so (mostly prot and green with some efas) and be on your way.
One way or the other you will gain a TON of weight... I can only predict that in 2 weeks you will lose a bunch of water, some muscle and not too much fat... All three you will gain back easily when you start a normal program.
next time, plan in advance. Do you normally gain 10lbs in 14 days? It works the same way in both directions.