There is no reason to be discouraged by what you call the evaporation of the consciousness that you got on the darshan day. It has not evaporated but drawn back from the surface. That usually happens, when there is not the higher consciousness or some experience. What you have to learn is not to allow depression, but remain quiet allowing time for the assimilation and ready for fresh experience or growth whenever it comes.
Ref: Letters on Himself and the Ashram