I don't even know what brought this one on.
Not to make light of this, because I recognize how serious anxiety attacks can be, but I find humour is a reasonably good medicine.
Perhaps you were looking at some lunch meat; maybe some prosciutto or a couple slices of capicola?
And if that reference is too obscure, you need to be watching more Sopranos.
For those that don't have any inclination to watch The Sopranos but still want to understand the joke: The lead character, big tough mobster Tony Soprano has anxiety/panic attacks whenever he sees lunch meat, because his father, another big tough mobster, used to do terrible, horrible things to the local butcher, who had a lot of gambling debts and paid them back with meat, usually after getting a severe beating from the senior Soprano while young Tony watched.