Spurs host local rivals West Ham on Sunday on the back of three successive Premier League defeats.
He said: "We're all frustrated about the way things are going. I don't know what's not clicking. Hopefully it will start clicking as soon as possible otherwise, trust me, we will find ourselves in difficulty.
"My friends tell me to keep positive so I don't really want to think about how bad it could be. If we get badder than this, I think we'd be dead.
"At the moment things are looking bad, but we just have to find a way to get through this. We have to improve because we're not playing the best game at the moment."