Thanks for writing your query.
You should get your husband fully examined and investigated to know the cause of his symptoms.
He should be nvestigated for :-
1. Complete Blood Count(CBC).
2. Absolute Eosinophill Count.
3. Chest X-Ray PA view.
His symptoms are suggestive more of anxiety
or panic attacks.
Clinical examination including chest auscultation along with the reports of the above mentioned investigations will be helpful in planning the treatment of your husband.
I hope this is helpful to you.