5th week, I doubt it's an allergic reaction, but still possible... more likely test flu kicking in and it might have spawned a respiratory infection or something like that that is making it hard to breath. Happened to me last week. Either way, the only way to do anyhting about it is going to the doctor. Unless he has other allergic reaction symptoms (skin redness, hives, tingling in the extremities, etc) I would just tell the doc his symptoms and leave the AS out of it, that is unless he has other alergic reaction symptoms like I said.