@msolga,
Sure isn't fair that someone as good a person as you Msolga could feel old and jaded, fed up, uninspired. Because none of it is true. You give so much to others. This funk will leave you, I'm sure.
Of all the things here mentioned to be of help, I like "doing something creative." I sit down and write some things about myself that could have brought on these feelings, even saying things like "I feel like killing myself." Yeah, that for sure will make anybody laugh because there are no reasons whatever to kill oneself - so, laugh, but tell it all. When I read over this soul-searching masterpiece sometimes a poem is there, or a story.
I also take oil painting classes. My last teacher is a genius from England (scholarships, art since a child) who paints by demonstration, meaning she paints for her own art shows, pointing out to her students each step taken - planning the colors, mixing the paints, the strokes. She also tells us about her life - amazing woman and the things that have happened to her! We have to mix fast, paint fast. God, how strenuous, when we're done we are totally exhausted, and rejuvenated.
I think these things are all in our minds. This is not you, msolga. You are the most delightful lady! Tell your mind to just stop that.
And, music. I sing some ditty, like, "Hello darkness, my old friend. It's good to talk with you again," (John Denver, I think)
I also like to go to a zoo, or a pet store, as I love animals so much. They smile all the time.