My typical day is an average burn of 2900 calories. I am on a new medication where the thought of food makes me want to throw up, so there have been days where I am only consuming 1100 calories. So 2900-1100= 1800. That 1800 is the weight loss deficit (3500 for every 1 pound to loose) K, seems awesome enough and you would think the weright would be flying off. BUT When yur body has a high deficit, your metabolism will start to decrease, and your body will go into starvation mode. it is best to keep that deficit between 500-800
To keep track of my calories burned, consumed and excersie I bought a BodyBugg. It's a device I wear on my arm and is the only device on the market that is clinically proven to give you 100% accuracy. If you go to bodybugg.com there is more information and testimonials. I don't have fibromyalgia but I do know there are people who use it that have other medical complications at loosing weight, but have been able to do it using this device. If you have facebook you can also go to their facebook page and see the community/support that they offer.
That being said, getting at least 30g of protein a day, drinking 64 oz of water, and having enough fruits, vegis, and lots of fiber is key. Good luck and don't give up! Remember any weekly loss is still a loss, and YOU CAN DO IT!!!