It does sound horrible, and I felt like crying too...Dolly would cough, then shiver and look miserable. BUT, it really gets better every day. Just hold her and stroke her and talk gently to her, and day by day she'll be better. I think Dolly was 100 percent better in about a week.
I hate kennel cough, but there isn't a lot you can do. It's like a cold...it has to run its course.