That would be despondency/despair, I go through it every Pascha time and it sucks. You need to force yourself to go to confession and get it out in the open asap. Say your prayers, take the Holy Mysteries and fight through it. The holy church fathers say this is the worst of the passions and it's what pulls people away the most. It's going to be very hard, you will feel lazy, uninterested and dull during church service, you'll want to willing sin. All in all it's hell, it's a living hell. There is hope, we have a merciful God, if I can get through it anyone can. My prayers go out to you, I know what it's like and it isn't fun, but you need to keep fighting! God help you.
Here is a story I'll share with you that talks about this tool of the devil we call despair
"One day, the Devil laid out his gleaming, razor-edged tools upon a worn and ancient wooden table. He announced a "fire" sale and carefully marked the price upon each tool:
ANGER: $100, RESENTMENT: $400, HATRED: $600, etc.
Each tool sold almost as quickly as it was placed upon the table. Toward the end of the day, a crooked old man in tattered rags approached. The man eyed the tools that remained, but was taken by a certain tool at the end of the table. The tool resembled the two long and bowed fangs of a viper. Its chrome-like pointy tusks caught the sun and sent flashes of blinding light everywhere. With one hand, the old man blocked his eyes from the glare and with the other, he reached for the tool. As he grabbed hold, the tool's steely, needle tips nearly pierced his hand. This seemed to please the old man. He snatched up the tool and held it to his chest. With a glint in his eye, the man asked the Devil, “How much for this one?” “I’m sorry, that tool isn’t for sale,” the Devil replied. Without hesitation, the man said, “But I’ll pay double. I know how valuable it is.”
The Devil narrowed his eyes and hissed, “Sir, I’ve told you, that tool is not for sale, nor will I ever sell it. It is the most useful tool I own and without it, I wouldn't be half as effective in my work. With that tool alone, I can pry open a heart, and once I get in I can do most anything I want. It is badly worn because I use it on almost everyone, since very few people know that it belongs to me. Now good day, sir.” Dejected, the man looked once more at the shiny tool, then slowly placed it on the table. With almost a whisper, he said to the Devil, "If I can't buy it, would you, at least tell me its name?" A slow and wicked grin grew across the Devil's face. "Of course, old man, its name is... Dispair."