"Their nearest approach to constancy, therfore, is undulation-the repeated return to a level which they repeatedly fall back, a series of troughs and peaks. If you had watched your patient carefully you would have seen this undulation in every department of his life-his interest in his work, his affection for his friends, his physical appetites, all go up and down. As long as he lives on earth periods of emotional and bodily richness and liveliness will alternate with periods of numbness and poverty. The dryness and the dullness through which your patient in now going are not, as you fondly suppose, your workmanship; they are merely a natural phenomenon which will do us no good unless you make a good use of it."
My conclusion: Hang in there, it's going to get better again. Don't stop trying to improve. Provide a place within your heart and mind for Providence.