I'm really mixed up on this ms life.

It is IMPOSSIBLE to finish raising 2 teenage kids, "be there" for 2 adult children, and be basically a nurse for an ailing husband, and work full time. Sounds like a pity party. But I've backslid into powering my through life and today I'm so depressed.... can't stop the tears. Please help me know how to slow down with life and still feel like I'm being a good person. I just want to crawl under a rock and stay there. I hope somebody hears me. I have no one here to talk to.