What you have is called Diabullemia. You can google it and maybe find a support group. It is not the safe way to lose weight. The way to lose weight is to optimize insulin dose levels, so that you can exactly match your insulin to your food. Your family must be so worried about you..
Hi. Very difficult. Are you on a low carb diet? Low carb diet is the best way to minimize lows and highs. If you are constantly having DKA your blood sugar must be so very high. I suggest you read the book "Diabetes Solutions" by Dr. Richard Berstein. It teaches you how to use and fine tune insulin doses. It also teaches you how to eat very low carb. There is a facebook group called Type1 Grit. Please look into that. Also, U-Tube "Bernstein Diabetes University". It will take effort to get this under control, but it will be possible with the right tools and knowledge.
What insulins do you take. Have you done basal and bolus testing? Do you have an experienced diabetes educator to work with you on setting your insulin doses right.