Yr is the letter Y
Anglo-Saxon Rune Poem (from ragweedforge.com)
Yr is a source of joy and honour to every prince and knight;
it looks well on a horse and is a reliable equipment for a journey
Yr reversed indicates a loss of skill, ability, and efficiency. One of things I associate with Yr is the hands, and in a reading for health, Yr reversed would indicate problems with the hands. In general, it might indicate a need to pay attention to what you are touching, and how you are handling things, physically and metaphorically. Are you being too rough, or too gentle? Maybe just the excessive repetition of a certain action is beginning to wear you down, in whatever the issue is about. As you force yourself through the motions, you find that your effectiveness deteriorates because you just can’t before like you were able to before.