Your husband needs to go to the emergency room IMMEDIATELY! Chemwapua is on the money. The symptoms are consistant with that of an aneurysm.
Go to a doctor, Im not a doctor but 1st thing i thought of was an aneurysm which i have had and the pain was the same for me, The doctor told me that most people get the headach 1st and the the aneurysm ruptures later and that is what kills them or it could be a stroke.