I'm a therapist and everyone has correctly addressed the question. A combination of cognitive therapy and possible medication if persistent are the usual treatments, and the doctor will assess the cause and find a diagnosis.
We usually give out involuntary signals which may be interpreted by those skilled in reading body language. Someone might spot that a person has guilt feelings but nobody can read what those feelings are in detail. The fear is totally irrational which is why a professional Cognitive Behaviour Therapist can help.