Wunjo is the letter W.
Anglo-Saxon Rune Poem (from ragweedforge.com)
Joy he enjoys who knows not suffering, sorrow nor anxiety,
and has prosperity and happiness and a good enough house.
Wunjo reversed indicates there is some things weighing on upon, preventing you from experiencing simple joy and comforts. Perhaps a difficult illness or health obstacle, or a reason for sorrow and melancholy. Perhaps it is even just adjusting to changes around you that might be beneficial, but can still present challenges, even if those challenges exist only in your mind. Little points of stress and anxiety have seized upon your imagination, and taking up your mental energy and expression.