With the history of symptoms you are mentioning, there needs to a detailed history evaluation of the symptoms. Fear of being insane could be part of the acute anxiety that you are expressing. All the symptoms you mentioned shows sudden onset of anxiety.
There could be multiple reasons for it.
Next Steps
Consult a psychiatrist. Detailed history evaluation of past history, comorbidity, family history, personal history and present mental status examination will aid in the diagnosis and treatment.
Health Tips
Haloperidol at low doses can be used to augment primary molecule in reducing anxiety. But actual indication of haloperidol would be better known by the doctor who prescribed it. There may be a necessity to add certain other drugs to control your symptoms.