I'm by far not an expert, as I'm only just starting to work out myself.
I agree with what someone else said, 1000 calories per day may not be enough, in which case your body will go into starvation mode and burn muscle instead of fat. There's some good advice here, particularly dealing with adding variety to your workout.
Eliminate that Weight Plateau and Start Making Progress!
Just keep working out, eating right, and comparing your calorie intake to your calorie usage (should not be higher than 1000 calorie deficit from what I'm told). Just knowing that you are following a healthy lifestyle and doing right for your body is more important than jumping on the scale for reassurance.
It sounds like you're doing great!
You just need some minor tweaks to balance out your nutrition.
DISCLAIMER: I am NOT an expert in nutrition, fitness, or exercise. Any advice given is only meant to be helpful based on what information I've gathered, and should not replace any medical treatment or any other true advice you may get from another source. Take it with a grain of salt, and then log that in your Foods tab!