Hi Nala, welcome
I don't find my diabetes control impossible, I find it a challenge. If I have a bad day or two, rather than get uptight about it, I just start afresh again the next day, knowing that I've got it right before, so can do it again. Stick with it it does get easier. As for depression, I'm lucky so far and not suffered with it, but speak to your doctor if you do.
John.