Smokey is Coughing

[Dee & Evan]

Smokey started his Doxy regiment last Wednesday for his Hemobart.  I 
started him on his Interferon this morning (Sunday).   The vet suggested 
I ease him into each regiment one at a time so if he has any symptoms we 
may be able to pinpoint which regiment caused the problems.  I am hoping 
to start him on the Lysine this week.  However, I am still worried about 
his breathing.  At times he seems to have labored breathing and at other 
times it seems to be better...but still not great.  However, I have 
noticed on at least three different times within the past week that he 
has had a coughing fit that takes him a while to cease.  It seems to be 
a "true" cough, not a hairball cough.  He has no discharge from his nose 
or eyes.  Does anyone know what is a cat's  normal respiratory rate?  
The vet wanted him to come in any way in about 5 to 7 days from when he 
started the Doxy to do some blood work (this Tuesday).  But I don't know 
if it would be better for him to wait due to the stress of the travel to 
the vet or if it would be better to take him in right away due to his 
coughing & breathing.  I know any stress can make the virus do more 
damage.  Does anyone have any advice to lend me?  Any input would be 
greatly appreciated.  Thanks.

~Dee