The Rocks crumbled in the FA Trophy third round last night, losing 5-2 at home to ten man Spennymoor Town.
The replay defeat came after the National League South side let in seven as they came unstuck at St Albans City.
Earlier in January, Coventry’s team shipped four goals against Braintree and three at struggling Essex neighbours Concord Rangers.
But after losing the chance of an FA Trophy quarter final place last night, the East Thurrock boss needed answers.
“We need to get our heads around it,” he told BBC Essex Sport. “But it’s difficult to explain what happened.
“The obvious thing to say is that we were terrible. Spennymoor are a good side and credit to them, but we didn’t help ourselves.
“Our form is so up and down, I don’t know what I am going to get from one half to the next.
“I have to be honest, our mental strength and the moment is at zero.
“Every time we make the same mistakes. Every goal we concede you can picture it being the same thing as before. They have punished us and we need to come up with some answers now.”
It’s now time to focus on their league campaign, Coventry says.
“We have enjoyed the FA Trophy run, we played well up there on Saturday, but it is very sad to end things like we did,” he said.
“We’re out now and we somehow have to now find a way of picking up some League points.”