I agree your trainer is indeed a bad one.
You have to consider first your Basal Metabolic Rate, which changes according to your age, height and weight, and is what your body burns just by performing basic activities (breathing, sleeping, being awake, etc.). Then you should add the calories you burn with your job and daily activities.
It is highly unlikely that 800 calories a day (1000 minus what you would burn with the suggested workout) would be enough to substain your body. You would lose weight very fast, and get these two results: 1) Losing muscles, weighting less but looking the same, only a bit more flubbery. 2) Going, as someone said, into "starvation mode", with big damages to your metabolic sytem (and with a considerable weight gain as soon as you start eating again).
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