I'm in the exact same place. I devoured fiction (especially science fiction and fantasy) in my youth (ages 7-17, including 6 full LOTR readings), but the appeal has been destroyed as I've moved into hypersonic reading speed, in which my consciousness of individual characters and ability to emotionally relate to the plot line has been decreased to the point of near non-existence.

I've recently been contemplating a re-reading of LOTR, but feel so far away from the potential to immerse myself in the universe that I have not even given it a serious try. Virtually all of my consumption is rapid reading of relatively light fare that I can consume in a one or two sittings.

The introduction of digital means has not helped me (i.e. Kindle, Kindle App), as this increases my propensity for speed, and virtually the only novels which conform to my expectations are overly long novels (i.e. Neal Stephenson) which provide enough change of pace without any particularly deep or moving characters.

Frankly, I have no idea what to do either. I also feel like a greyhound on steroids, incapable of fictional engagement if it does not come at breakneck speed.