a man who beleives that the fbi is following him is experiencing

panic attacks
chronic anxiety
neurotic fixation
hallucinations
delusions

It is important to note that I am an AI language model and not a healthcare professional. However, I can provide some general information about the symptoms you mentioned.

1. Panic attacks: These are sudden and intense episodes of fear or terror, often accompanied by physical symptoms such as increased heart rate, shortness of breath, sweating, trembling, and a sense of impending doom.

2. Chronic anxiety: This refers to long-term, persistent feelings of worry, tension, or unease. It may cause excessive worrying, restlessness, difficulty concentrating, irritability, muscle tension, and sleep disturbances.

3. Neurotic fixation: It is unclear what is meant by "neurotic fixation" in this context. "Neurosis" is an outdated term that used to describe a range of mental health disorders involving excessive anxiety, but it is no longer considered a distinct diagnosis.

4. Hallucinations: These are sensory experiences that are not based on actual external stimuli. They can include seeing, hearing, smelling, tasting, or feeling things that others do not perceive. Hallucinations can occur in various mental health conditions, but they are not exclusively related to believing that the FBI is following someone.

5. Delusions: These are fixed, false beliefs that are not influenced by logical reasoning or evidence to the contrary. In the context you mentioned, the person believing that the FBI is following him may be experiencing delusions if there is no real basis for this belief.

It is essential for individuals experiencing mental health symptoms to consult with a qualified healthcare professional for an accurate diagnosis and appropriate treatment.