Demiphobia
demiphobia is the fear of being watched by someone or something you can’t see. I made the word as it doesn’t have a word!
Demiphobia has nothing to do with demisexual stuff actually, it is named after the Greek god of paranoia or terror Demios!
Signs of demiphobia are:
paranoia
very alert all the time
scared of being alone
and of course, thinking somthing is watching you