I promise, you'll breathe normally again.
It may be a while.
It may be longer than you'd like or expected.
But the waves will space out a little more, they will get a little smaller, and one day, you will actually be able to take in big gulps of air between them. And another day, some time after that, you'll be able to breathe fairly normally between the smaller waves.
One day, I'm told, the waves go altogether and everything about the person and the relationship looks much different.