I'm currently a size 10 and they fit me a bit loose. I want to a fit comfortably into a size 6 by September 1st. Is this possible? If so how and has anybody lost this much this fast?

I eat anywhere between 800 to 1,200 calories per day eating wholesome foods. But I usally eat 2 meals per day. Today for example I ate chicken breast with some spanish rice a total of about 410 calories then for dinner I had spaghetti(the noodles were wheat)about 260 calories and I had about another 160 on a snack. Before I ate(eat)I did between and 1hr to 2hrs of dancing which is about 520 calories burned then I do squats, pushups, crunches,plank for 30sec,etc..

With every meal I take Alli which blocks all fat form being stored and comes out in a bowel movement(s). I drink 2 or more liters per day sometimes during the middle of the day I'll drink a Coke Zero. I don't eat after dark which is about after 7p.m. In the afternoon I swim for an hour or more and during that time I jog around the pool, do the vaccum pose, lunges, arm circles, crunches, I also have my younger brothers take turns holding on to my back while I jog/run. I also live in a region where it's over a 100ºF during the day so while I'm out doing yard work I'm sweating.

I know it sounds like I'm doing good but what I'm asking is...

A) Do you think this is possible?

B) Will it work?

C) Are there any tips you can give me?

D) Have you lost this much or more and if so what did you do?

P.S If your gonna say anything negative don't say anything at all please!!!

P.P.S This coming week from sunday to sunday (Aug 4 to Aug 10)I will be having relatives over I might not get to workout as much everyday I will keep up a good diet though. It might be tough because when they come us girls go and buy a sh*t load of groceries and most the time it's a whole bunch of junk food! :/ But I will try my best not to have so much and squeeze in as much exercise as possible!