The Shaymen were defeated again on Saturday as they went down 2-1 at Havant.
Halifax still haven’t won in the league since late August but the manager refuses to panic after their terrible run went on.
Fullarton says mistakes at key times are proving costly and more focus is needed if they are going to rescue the situation.
“It’s really frustrating as we were very much in that game,” said the Scotsman.
“I’m disappointing because two big errors have cost us on both goals. We can’t be doing that.
“It was a very even game with little to choose between the teams so to come away from it with nothing is hard to take.”
Next up for FC Halifax is an FA Cup First Round trip to League Two Morecambe.