I have been an atheist for some time and I recently realized something that I am
As a theist, I would love to welcome you back, but in all honesty I suggest that atheistic philosophers have worked quite hard to argue that life without God can be deep and satisfying and while pleasurable not hedonistic. In fact, one member of this panel, Louise Antony has edited a book called Philosophers without God which you might find hopeful and uplifting. You might also look for Robert Solomon's Spirituality for the Skeptic or The Really Hard Problem:: Meaning in a Material World by Owen Flanagan. Some atheists do place a premium on caring for other persons, but some also care about other things --for example, caring for nonhuman animals or wildlife areas, artwork, science, and so on.
If you want to compare atheistic and theistic views of values, you might check out a recent book I co-authored with the American artist Jil Evans' The Image in Mind; Theism, Naturalism, and the Imagination (Continuum, 2011). Sorry to hear that you're feeling down! I hope things turn around for you asap.