Assuming there has been a significant past trauma and the diagnosis is right. Your husband would be benefitting from psychotherapy and medications. CBT for anxiety and depression in a individual therapy setting and group therapy with other patients with similar symptoms is extremely beneficial. Additionally, EMDR treatment with a experienced therapist will help. First line treatment with meds are antidepressants. Depending on previous exposure to them, they are chosen to target PTSD. Symptomatic treatment of panic symptoms with brief treatment with benzodiazepines is beneficial. Care should be taken that they may have addictive potential. Sleep meds might be needed for symptomatic treatment and Medicines like Prazosin might be beneficial for reducing nightmares. Most importantly your husband needs to learn appropriate coping skills so he can manage the triggers and prevent escalation of symptoms.
Satish Narayan, MD