Depressed and tired after several years of caregiving for wife, who is on a rollercoaster of health issues. But many of you have it so much worse, you have my sympathy. Here is something I found in a Buddhist magazine I was reading that was helpful.
"Everyone is on their own life's journey."
"I am not the cause of your suffering (or not the exclusive cause)."
"It isn't in my power to end your suffering, although I would like to, if I could."
"Moments like these are hard to endure and yet I will continue to try to help where I can."
Don't know if this will help anyone, but it helped me put things in perspective. A little. Best of luck, everyone.