Is there a medical reason for you to lose weight quite quickly? Is your doctor a specialist in weight loss?
If neither of the above are true, then I'm afraid that I would think that perhaps your doc is not overly knowledgeable in this area and just went with the standard "you're female - 1200 calories per day - next..."
If there is no medical reason for super-quick weight loss, and since you're not feeling well at the lower calorie range, why not try the Spark recommended range for a month or so and see how that works for you? The worst that could happen is that your weight loss will slow down a bit, while the best would be that you'll continue to lose but feel better at the same time. I suspect that many of us on the site have had to play around a bit to figure out what calorie range is optimal for both weight loss and feeling well.
If there is a medical reason, then please ask for a referral to a dietitian to see if they can work with you to come up with the best calorie range to lose weight safely in the time-frame required, while still allowing you to feel well and enjoy your workouts. It's important to call in the experts for help when you're dealing with medical issues (us well-meaning folks on the net just don't have the qualifications for that!).
Kudos on your success so far!
Start weight: 240 lbs
Goal weight: 155 lbs
Afraid of a colonoscopy? Believe me - they are much less frightening than surgery and chemotherapy.
Colonoscopies allow polyps to be removed before they can become cancer, or let cancers be found before they are too widespread. If you are 50 or older, or have any symptoms, please don't let fear stop you from covering your butt.
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