Hiya. I felt compelled to answer your post as I'm in a very similar situation with my weight, although the diabetes is pretty well controlled. I have been struggling like mad with the carbs vs cals thing, which you obviously know about too. I lost a lot of weight over a two year period, partially due to low carbing, partially due to serious illness.
The past 18 months have been incredibly tough and I haven't been as vigilant and in the past 6 months, I've gained approx 6/7 kgs - as someone with a binge eating issue, that's really bad news. But I think the way forward - for you and me - is to approach each day with hope that today it will be better, today we can manage to eat the right foods. My family don't eat the way I need to, and that's where I've slipped up, eating the same stuff as them because my mind has been on other things.
I feel empty too, I wouldn't dream of WW or SW, so it's down to me. Let's be mindful of what we are eating, do the best that you can. Motivation is difficult, when mood isn't great, time can be seriously wasted looking for motivation that just won't come. Forget motivation, just get out the front door and walk. 5, 10 mins is something, any exercise is something, will make you feel better too.
Take heart. Be kind to yourself and don't look backwards, concentrate on today.
Lots of luck