Yes Daniel is anxious about the Kings reaction. Nobody wants to be the bearer of bad tidings - that too to a king who is quick to anger and has such a big ego. Besides, there were instances I the past when people were punished for not 'pleasing the king, there was no way to know how the king would react to an honest answer - therefore it must have been difficult for Daniel.
Humans are unpredictable. There's no way of knowing how somebody will react to bad news or something they don't really want to hear. The truth is often bitter and no one wants to be the bearer of that bitter truth. It might make us lose favor with that person and we want to be popular and liked.
We should pray for a sign or divine intervention- God will lead the way. We should remember that we are his instruments and he is our maker