Caregiver Stress and Depression

My mother has advanced lung cancer and is receiving chemo. I live with her and am also her caregiver. We have been very close all of our lives, and I am having a hard time adjusting well. Sometimes I even get angry with her and then I feel guilty. The next step is I get depressed and have thought about a way out, but have not attempted anything. Can you suggest anything to help me cope?

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