I understand how you're feeling. I to a mental health nurse and I don't always recognize the signs.
In 2011, I had a major suicide attempt. I was in the worst depression I've ever been in. I haven't been able to work since.
I had a good 6 months of total stability and I was actually making plans to get back to work. Then in February it all started coming back gradually. I've just been through a mixed period. Now it's either depression or hypo mania, I think. I have to figure that out still.
Maybe you need to take a little sick leave to get yourself together.

Now I really am just speaking about myself here but I always removed myself from any kind of patient contact, but really that's just me. A bit of a break might help. If your stressing it's only going to make your moods worse and take the chance of an absolute crash.

Just my 2 cents worth.