Aahhhhh yes, Nanners has such a great point. I too hate when everything seems really good and I try to just enjoy the moment and not worry about when, not if, the anxiety will rear it's ugly head again.
One of the best remedies for anxiety is to talk about it. Here's where good friends and family can come in. The old adage "A problem shared is a problem halved" comes into its own here, and while you may dismiss it as nonsense, it may surprise you how anxiety alleviating it can be to just talk to someone.
Do try to keep your breathing under control and call someone that you can just talk with, someone that you can tell how you are feeling. Shed a few tears of anxiety and you will be surprised how that will let off some of the scary feelings you are having right now. Most of all know you will be OK. You are safe and you always have us to talk to.
You are family here.