Nihilism, as a philosophical position, can be treated by reading better philosophy.

Got any suggestions?

I should have forseen that someone would ask that question.

Well, actually, I know almost nothing about "meaning of life" philosophers, except that there is this position called Existentialism. According to wikipedia:

The early 19th century philosopher Søren Kierkegaard, posthumously regarded as the father of existentialism, maintained that the individual is solely responsible for giving his or her own life meaning and for living that life passionately and sincerely, in spite of many existential obstacles and distractions including despair, angst, absurdity, alienation, and boredom.

I've never read Kierkegaard, but I first heard about him in my teens, learned roughly what that wikipedia quote says, and have ever since then called myself an existentialist regarding the meaning or purpose of life. It just made sense to me. And I now realize, to my embarrassment, that I never bothered to ask the question: "Why bother making up a meaning for life, if it doesn't already have any intrinsic meaning?" Or, if I did ask, I must have answered the question in the obvious way.

"Why not?"

Maybe Kierkegaard has a better answer. Though I don't see how he could.