I can resonate. Some days are like that. Some days when I have a big block on the morning, I know I am conditioned for the whole day. When I have a day like that I try to be honest with my past experiencie. I know that day will be harder. So I try to do as little things as possible. I don´t want to drain my energy more than is neccesary. If I have an apointment, or a tennis game, or whatever that is changeable, I do that. I try to rest so the next day I will be on a better mood and in consequence more fluent. In the past I used to "Do it anyway" but that will drain your energy and wear away your soul. Hope it helps.