hugs hugs hugs
I understand how you feel. I am not a cutter but I majored in Psych so I understand why people do it. It is only a temporary relief for your pain and won’t solve the deeper issues here. But I am sure you know this. Plus you do not want to look back in 20 years and see those scars. Yes, the pain might always be there in one way or another but you can find other ways to cope. I know it does seem like it now but you can. You have lots of other options. It is a long process to stop this sort of thing but taking the first step will make you feel better. Don’t be so hard on yourself too. I am sure you are doing your best and you are strong person to have to deal with this disease at such a young age. Hey, I am 40 and just was diagnosed and I can hardly even deal with it! 
And how nicely you write! Keep at it! I understand. I have to put my thoughts down in a blog too sometimes but they are too weird to tell them to anyone. This is a good thing. It can be therapetic for you. It is a good alternative to getting out the pain as opposed to cutting.
Treatment for you: Get the blood sugar down and find someone to talk to about your cutting. And lots and lots of hugs from the people here at TuD as a replacement. I am sure they will be lined up around the block for you and you will have more hugs than you will know what to do with!
Hang in there! You will make it through. (more hugs!)