I've just driven back from town with my DD being hysterical in her car seat. I had to pull over once as I was worried about her. Gave her lots of cuddles, got a burp out...thought, right let's get home. No she had other ideas and typically the bloody traffic was bad therefore prolonging the agony on my ears and my poor baby's throat 
How do people cope with these stressful times? She's in her bouncer chair now, absolutely fine so I just don't know what the problem was 