What Causes Abnormal Behaviour In A Person?
The symptoms are probably due to some psychotic episode and need evaluation
Detailed Answer:
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I can understand your concern. His symptoms like rage coming out from nowhere, talking about thing that really never happened, feelings that everyone is trying to oppress him (suspiciousness or paranoid ideas), silent conversations or using hands as if he is gesturing to someone (hallucinatory behaviour probably), moving mouths or muttering, talking to someone etc are probably due to some psychotic episode. It could be due to mania with psychosis or Acute psychosis (if recent onset).
I would advise you to consult a psychiatrist for his problems. If he is not getting ready to visit a doctor out of his abnormal beliefs then you can visit a psychiatrist alone. As he is your husband and you are his caregiver so you can discuss with a psychiatrist to prescribe some medicines after evaluating his history. In his case antipsychotic medicines can work to improve his symptoms.
He will refuse to take medicines in such case medicines that are available in tasteless and odourless preparations can be given to him without informing him by mixing with foods or water for short time. In some time he would become compliant to medicines. Medicines like Risperidone, Olanzapine can help in his symptoms and are available in liquid tasteless and odourless preparations. There is no need to worry about his symptoms. These symptoms respond to antipsychotic drugs and the response is good. Consult a psychiatrist for prescription of drugs.
Thanks, hope this helps you. Please don't hesitate to ask again for more doubts.