If you really want to learn about sitting with feelings, read the books of the American Buddhist nun Pema Chödrön. This is a key element of the ancient Tibetan Buddhist practices called: "Lojong" (mind training) she teaches. Two of her books I would recommend in particular are: Start Where You Are- A Guide to Compassionate Living and Comfortable with Uncertainty 108 Teachings on Cultivating Fearlessness and Compassion.

But do keep in mind though, if you just read them & put them aside, they will just be one or two more books you happen to have read. You have to read & re-read them over-&-over (and also follow the practices.) Over time, the tremendous wisdom contained in those books will gradually work it's way into the deepest recesses of your mind & it will begin to become second nature. I wish you well...