One of the days when I feel like nothing

They don't happen that often, but I just feel depressed, anxious, and void of emotion atm. I don't know why, but I just don't feel like doing anything, and I don't want to do anything. It might be a combo of the chilling weather we have had for 2 months straight, relationship issues, job issues .... anyone else have, or currently having, one of those days?