T93,
Go speak to your GP, it might not be highlighted in your Medical History page - Just down on your notes page. Misdiagnoses are hard to get, as I think it needs to be the original Doc that did it, not too sure.
However, I guess Asthma is quite easy to spot, and as I take it you never went back to claim the medication didn't work, this confirms the diagnosis.
But I'm no Dr.
Good luck.