@kalebmatthew445- Welcome to Mayo Clinic Connect. You are in great company here. It must have been extremely scary when you all of a sudden found that you couldn't take a deep breath, a satisfying breath. There are lots of people on here that suffer from SOB who also have asthma. I'm wondering if you have seen a pulmonologist or have had a lung function test.

What a lot of people here have found is something called Hyperventilation Syndrome. This is where the balance of Co2 and O2 are off and the panting changes the pH balance in your blood. (Hyperventilation, sustained abnormal increase in breathing. During hyperventilation, the rate of removal of carbon dioxide from the blood is increased. As the partial pressure of carbon dioxide in the blood decreases, respiratory alkalosis, characterized by decreased acidity or increased alkalinity of the blood, happens.)
Emotions can certainly cause this, and out of the blue too.
You can tests this yourself by carrying a paper bag around.

There are also a lot of other types of lung exercises to try also but I thought that the paper bag was easier, to begin with. Before your first incident had you had an upheaval in your life, more so than at any other recent time?