My Boyfriend, Who Is Under A Lot Of Pressure At

My boyfriend, who is under a lot of pressure at the moment and who drank a lot today (a weekend day) suddenly felt short of breath and was shivering even though it's hot...we live in Dubai. He is asleep now but moaning and groaning. I think it is anxiety but am worried. He is 40, smokes and is fit but a little overweight. He plays football, tennis and runs but not every day.