that you can find a cause, or at least something to set your mind at ease soon. I don't have any advice to offer, but I did want to welcome you to the site and start bugging you for pictures of your handsome boy!
Hmmmm...on second thought... You know, I have asthma, and I often find myself coughing at the end of the day and just after rising in the morning. Could it be some sort of asthma?
Just a thought...