Samanthakate, diabetes sucks. I ride the waves every day, so I do feel for you. I've struggled with diabetes - and my emotions around it - for years. It is so easy for me to be dragged back into that place that tells me I'll never get there.
Therapy saved my ass. Is this an option you can consider?
Today, I literally remind myself to take it moment by moment, just for today. I'll share with you some of the tips I use, if anything is useful to you, that's great. I've tried to find ways that I can express my emotions: I have some colours (pastels, markers). I've used graphic design on the computer to express my feelings too. I write, all the time, I write. I try to find ways to distract and / or keep calm: showering at any time of the day when my emotions are too overwhelming. Walking - sometimes I just need to get out. Drinking coffee or hot choc and sitting curled up on my couch and watching a movie / writing answers on quora or facebook or on here. Lighting smelly candles.
For a while now, I write all the things I'm grateful for, every day. It gets me out my head and keeps me focused.
I totally relate to the despair that diabetes brings. I've lived stooped in this for a long time. I've just ordered the book "Diabetes Burnout, William H Polonsky" which is meant to be great.
One more thing - when I can't change my emotions, I work very hard to accept it, so today I feel sad, and just allow it.
Once again, I recommend therapy, because it literally saved my ass.
Hang in there and reach out as much as you need.