noun

feelings of severe despondency and dejection.

self-doubt creeps in and that swiftly turns to depression

melancholy,misery,sadness,unhappiness,sorrow,woe,gloom,gloominess,dejection,downheartedness,despondency,dispiritedness,low spirits,heavy-heartedness,moroseness,discouragement,despair,desolation,dolefulness,moodiness,pessimism,hopelessness,the slough of despond,upset,tearfulness,the dumps,the doldrums,the blues,one’s black dog,a low,the blahs,a funk,a blue funk,the mopes,clinical depression,endogenous depression,reactive depression,postnatal depression,dysthymia,melancholia,dolour,the megrims,mopery,disconsolateness,disconsolation