Losing weight, but plateau too long.

Hey! I have a quick question. Well, it's kind of long, but I don't think it should be too hard to answer for anyone who's been T1 and overweight.

So basically since about this time last year I've been losing fat. At the start, I weighed 128kg or 280lbs. I was kind of athletic and could run 4km easy. My endo put me on a 1000kcal deficit, which I meticulously calculated for and lost 10kg or 22lbs in about 6 months. Great!

Around the holiday season though, my weight loss stopped. I was still on the deficit and really meticulous with my calculations. It seems I have reached the plateau of water retention or whatever it's called. So my endo argued for doubling down, that is, 2000kcal deficit. At that point (and now) my BMR * activity is around 3700kcal, not including thermal/non thermal heat loss. I only eat 1700kcal at this point. I lost 2kg in 6 months, so 4.5lbs perhaps. But I feel absolutely horrible, my insulin resistance shot up from 9g/u to 3g/u, I can't exercise anymore, because my blood pressure spikes and I get exhausted immediately, if I do an outdoor activity for a day or so, I get incredibly sore and have my BGL drop like hell (eating 40g-120g just to cover everything). My body temperature has lowered to between 94 and 96F.

I think I am eating too little, perhaps (and I know this might be ridiculous) I am starving somewhat. I've visited my endo yesterday and she told me to go to 2500kcal deficit, but I already have incredible food cravings and feel markedly better immediately after eating. I will fall asleep if I have to go without food for 8 hours. But I will not lose weight.

Should I eat more? Should I go back to the deficit that made me lose weight, even though it would constitute technically eating more? I am afraid to waste time as the progress I've made was very hard.

Now, some people might recognise me around here as the guy who lives in a post soviet country and has been through 6 endos in two years who are clueless about what Bernstein or Scheiner would have to say in diabetes treatment. They don't know what ketosis is and one told me to take aspirin before my A1c, because that would make it better. Those who didn't, that's been my short introduction. Please forgive my cluelessness on some of the topics that you hold self explanatory. Thanks for any help!