Depression is normal at the end of treatment, and there are volumes written in various threads about that whole topic. Good for you in seeking professional help, as your situation is obviously exacerbated by the DM and the resulting limitations on your movements.

In terms of what is facing you, it is like the old joke about "How do you eat an elephant?" A:"One bite at a time."

We don't recover from this ordeal in one moment of enlightenment and wellness. It is a process -- two steps forward, one step back, just like many other things in life. If we attack it one day at a time, it is doable, and it is amazing the strength we can find.

Hang in there and keep posting!!