I'm a couple of months behind you. I've recently kept myself at 700-900 calories. The way I've been able to do it is by making Elina's chicken soup that I've changed up a little. I allow myself to eat as much of it as I want. I also let all veggies be "free" and I eat them in between meals. I'm finding that I don't feel deprived.
Feeling deprived is something that I've always struggled with.
Eating this way makes my carbs higher, but that doesn't seem to hurt anything. I'm losing again, albeit slowly.
Also, I've added 2 more cups of water - I'm at 14 glasses a day.
Anyway, just thought I'd let you know that you are not alone. Going back to 600-800 calories can be really hard.
*hugs*