Indiaemily sorry but I think you are being inconsiderate towards the people of this forum and those around you. We can't do anything to help except offer words of support and heaven knows, we've tried.
I'm able to put this out of my mind in between reading your thread but I am sure others will be worried sick about you and have trouble sleeping tonight. You can fix this by being honest with the nurses and letting them help you, and letting us know you've done that.
My friend lost her 20 year old son to suicide a few years ago and you have no idea of the pain she lives with every day. His funeral was the most horrifically painful funeral I have ever been to. When I was suicidal in the past, what stopped me was the feeling that it's bad enough that depression has caused me so much suffering, but it would be worse to transfer that suffering onto so many other people. I forced myself to hold on to hope and to seek treatment, and it worked.
I've had depression on and off since I was your age, that's over 20 years. In that time I've found out that if you try different drugs eventually you find one that works, and the same goes for talk therapy.
I've also learned a fair bit about T1 diabetes and I know that not only it is fairly easy (in most cases) to get it under control, if you do what you need to do, I also know there will be a transplant solution within a few years. I read an article about the woman in the US who has had a successful transplant already. All they need to do now is more testing then they can make it available for everyone. You could be one of the first people in the world to get a transplant, if you wait a bit longer.
Once your diabetes is under control they can try another drug for the depression. You'd be amazed how much better you will feel once you find the drug that works for you.
I really feel for your mother. Please be honest with her... she must be going out of her mind with worry and I bet she wishes you would talk to her.