I have an 11 year old mini schnauzer/yorkie mix. He develope diabetes about 3 years back and went blind from it 2 years ago. This past week, however, he's been seemingly deteoriating quickly? He's always gotten anxious from fireworks/thunder/smoke alarms but now he's anxious near constantly and for no discernible reason. He'll tremble and pant for hours at a time when there's nothing we can see that's triggering it. Do you have any ideas on why he's acting like this, or how we should help him?