Constant coughing in asthmatic 3yo - when to see doc?

[Gleek]

DD has had pretty much a constant cold since September, I have taken her to the docs once and he was fairly dismissive, kids get colds etc. She was diagnosed with asthma about 18 months ago although it's not an official diagnosis as they won't do this until older.

Tonight she has been coughing almost constantly for the last hour and fifteen minutes, to the point of retching/vomiting. She is also sweating buckets although doesn't have a temperature. She is taking about 35 breaths per minute which I think is in the normal range.

Would you get it checked out or just chalk it up to yet another cold?

I found with my GP that he was clueless about it, even after he was diagnosed by the consultant he still tried to argue he couldn't be asthmatic for ages. I think when they are so young its best to see an asthma nurse/paediatrician for these things as they are more aware of everything.