I am by no means an expert by any stretch of the imagination, but I'll share with you my experience and a little about my weight gain and loses.
My current measurements are 36, 28, 40, and I am sitting at around 155, which is a pretty uncomfortable weight (for me personally!) for my 5'4 height.
Last summer this forum got me really thinking about HCG as I weighed about 150 and I really wanted to weigh 115. I read the HCG protocol in it's entirety. But, I have absolutely NO will power, and so my (stupid, in hindsight) thought was that HCG would allow me to lose a crap-ton of pure fat in a very small time, and I would only need will power for a short amount of time.
I did the injectable HCG for about 20 days, and I lost about 12 pounds, but I was moody, all I thought about was food, and I cheated all the time so that instead of eating the 500 cals of protocol food, I would eat 500 cals of cake that day instead LOL I was an idiot. But I don't look back and blame myself. You would have to have the will power of a saint to make that system work, and I honestly think that the weight I did lose was purely a result of my HIGHLY restricted calorie intake. I wouldn't do it again for a few reasons: I don't have the motivation to restrict myself that much, I LOVE food, and because I was using it as a patch fix for the weight I had gained, when what I really needed was a lifestyle change. A lifestyle change really is 100% the only thing I believe in now because anything else will just be a series of diets, loses, binges, re-gains, diets etc...
I am finally ready to make that change and I have been changing my diet for about a week now (I know, I definitely have a long way to go!) and I'm actually not finding it that difficult at all! I watched a TON of motivating youtube videos that helped me decide on foods and snack options, because I am a carboholic, and a snack fiend. I am also currently doing Insanity which is a work-out by Beach Body from Sean T. It is absolutely brutal, and I so spend a considerable amount of time resting and drinking water, but I guarentee that in 35 mins I burn at the very minimum 300 calories. I also found this awesome sight called " Lose It! " and the website is loseit.com and it allows you to create a timeline for your weightloss journey and a daily diet plan and calorie counter (Goal day is Nov. 2nd for me, 1,200 cals a day, current weight 155, goal weight 120)
Here are a couple of my favorite youtube videos that motivated me soooo much and helped me decide a course of action:
About Lose It!:http://www.youtube.com/watch?v=0Pz-F5Tw1-s
Favorite Video! So Motivating and helpful with snack options:http://www.youtube.com/watch?v=GQLGm9DNR7s
Anywho, sorry for the novel but I wish you all the best and I encourage you to look around at motivating tips and tricks on youtube because they really are helpful. And I can't say I'd recommend HCG personally, but I do understand it's allure. I don't think it is a crazy goal that you could get down to 200 around September the all natural way. Healthy diets and exercise work super fast sometimes! My sister went from 265 to 180 in about 6-7 months using herbalife shakes and a healthy diet (she exercized exactly ZERO at that time as well)