Coping with Deconversion

I grew up a Mormon, but recently decided that the evidence strongly supports atheism instead of any religious worldview. My motto has become “I’d rather be sad than wrong.”

Unfortunately, I have indeed become very sad as I think about the ramifications of my new worldview. Why should anything matter if we’re just arbitrary self-reinforcing arrangements of chemicals? Why should I avoid death if it’s just the chemicals finding a new arrangement?

I’ve explored several philosophical schools to try and cope (constructivism, nihilism, existentialism, etc.), but very little is actually making a difference.

What helped people in this community with similar experiences?