Autophobia, also known as monophobia or isolophobia, is an irrational fear of being alone or isolated from others. People with this fear may experience feelings of panic, dread, and anxiety when they are alone or separated from people they are close to. Symptoms of autophobia can include difficulty
From Wikipedia
Autophobia is the specific phobia or a morbid fear or dread of oneself or of being alone, isolated, abandoned, and ignored. This condition is associated with the idea of being alone, often causing severe anxiety.