Sometimes, there are just no words that seem to fit.  The more you try to find the right word, the harder it becomes.  In cases like these, there is not much you can do, but let it be. The wrong words only make things worse.  

abandoned, anguished, at a loss, at sea, baffled, bemused, bewildered, blah, blue, broken-hearted, bummed (out), cast down, chagrined, choked, clueless, crestfallen, crushed, cut up, dejected, deserted, depressed, desolate, despairing, despondent, devastated, discombobulated, disconcerted, disconsolate, discontented, discouraged, disenchanted, disillusioned, disgruntled, disheartened, dismal, dismayed, disoriented, dispirited, displeased, dissatisfied, distressed, doleful, down, down in/at the mouth, down in the dumps, downhearted, downcast, dumbfounded, fazed, flummoxed, forlorn, forsaken, friendless, frustrated, gloomy, glum, grief-stricken, grieving, heartbroken, heavy-hearted, inconsolable, injured, isolated, let down, lonely, melancholy, miffed, miserable, mortified, mournful, muddled, mystified, nonplussed, offended, pained, peeved, perplexed, puzzled, sad, saddened, shattered, solitary, sore, sorrowful, taken aback, tearful, upset, woebegone, wretched…

~Melissa