Unknown Medical Problem

My husband has been out of work since jan. Of 2004, the reason is of
cough syncope(fainting due to cough) since then he has seen a specialist
in the following areas with no true diagnose.

Cardio. With treadmill test, heart monitor(24hr), veins in throat looked at
and more. They have cleared him with a clean bill of health.

E.N.T. With testing done on his esyphogus, ears being cleared

allergist with testing with no signs of sinus or allergies.

Pulmnerist, (lungs)once again no signs of damage. He was given a brocholosgpy,no problem. Breathing test no problem.

Speech path. Again no problem

gasto. Given colonoscopy, and endoscopy again no problem.

His problem is no matter how hard or soft the coughs he passes out for
about 40 sec., never remembers all of the episodes. Loss of energy due
to coughing so much. He passes out about three to four times a day.
Living in texas the humidity does play a role. Also I have noticed that
when his enviroment changes(i.E going from the house to car) he coughs
and passes out.

We are hoping someone out there has heard of these systoms and can
help direct us. Right know we are at a lose.

Thanks for your help

carrie