Top 3 symptoms of Delusional Parasitosis: 1. You feel as if there are things crawling or moving on your scalp. 2. You experience itching symptoms over your entire body. 3. You have difficulty sleeping, often awakening at night convinced a parasite is somewhere in your hair. Often people with Delusional Parasitosis do not even have head lice, and develop symptoms of Delusional Parasitosis just by hearing mention of the words Head Lice. Confusion about head lice removal treatment can exacerbate Delusional Parasitosis symptoms.