My 4 year old son is extremely afraid of being alone. He will not be in any room without myself or my husband. If left alone he screams for mom and cries uncontrollably. If I go to the bathroom, he follows me. If I take a shower he sits right outside of the tub. When he says he is scared, I ask him what he is afraid of and he replies "nothing, I am just afraid". I am uncertain what to do and would appreciate any advice given. Thank you.