Wow, that's a ton of walking. Good girl!!!
But...bad girl for not eating enough calories! Don't ever dip below 1000. I lost a ton of weight doing just that, and it got me into a mess because it torched my metabolism. Once I started eating slightly more (a very reasonable and still very low 1500 per day instead of 1000), I gained about 10 pounds in a month. It took me two years to fix my metabolism and get it back on track. Not worth it.
Don't dip below 1300, especially if you're exercising. I am also hypoglycemic and find that I have to eat every 2.5 hours. The hardest part is the control part. Eating every 2 hours or so is amazing for your metabolism. But it can be really psychologically hard to eat just a little, at least for me
. I found that eating when I was out of the house was best, pack a snack and eat it when you can't hit the kitchen and get more helps tremendously.
My little sister is hypoglycemic and anemic, and she is a marathon runner and is a ditz about food. She used to pass out on running trails all the time because she'd forget to eat. Funny but scary.
You are absolutely killing it in the weight game and you are going to 100% succeed, especially with your commitment and drive. But don't shoot yourself in the food, put some good stuff into that wonderful body even if it feels counter productive. Gotta gas the truck so you don't burn out the tank!