Having a really hard time breathing?

Yes, I know should go to er, but I went there yesterday and they just said that it was because of my bronchitis. Xray was clear. But tonight (for the past hour) I've been having a horrible time breathing, can't make it through a sentence without stopping for breath. But my boyfriend also chalks it up to anxiety... and I really don't want to be going to the er in an ambulance if I'm just having a panic attack.