What really worried you? think of that moment, can you tell if there was tension in your body? sometimes you are not aware of being in tension with our muscles.. simply because you're always like this and you do not notice it but if you're tense you could unconsciously communicate a message to your brain that alarms it and triggers a series of reactions until you get panicked. In my somatic work I understood day after day how fast a muscle goes into action when the message to the brain is "danger"..and for the sensitized people very little is enough .. just a little worry, because it is as if we had a light always on and often we do not notice anything until we panic but it's too late.
What I do as soon as I notice something that happens in my body like pain or some strange feeling that scares me is to listen to that feeling and while I do so I suspend every evaluation..as " oh my god what happens" or "here again "... I just look at what happens and let time pass until it all ends. In this way you can break the cycle of fear/worry- pain-more fear-more pain-panic. The secret is not to escape from your scary sensations but rather go to meet them.
Claire weekes says (and I advise you to read Hope and Help for your nerves):
"Fear causes an additional outpouring of adrenalin, so that a heart already stirred to palpitations becomes further excited, beats even more quickly, and the attack lasts longer. The sufferer may panic, thinking he is about to die. His hands sweat, his face burns, his fingers tingle with “pins and needles” while he waits for he knows not what.The attack eventually stops—it always does—and all may be well for a while. However, having had one frightening experience, he dreads another and for days remains tense and anxious, from time to time feeling his pulse. If the palpitations do not return he settles down, loses himself in his work and forgets the incident. If, however, he has a second attack, he really is concerned. Apparently the wretched thing has come to stay!
Not only is he afraid of palpitating, but he is also in a state of tension, wondering what further alarming experience may yet be in store for him. It is not long before tension, releasing more and more adrenalin, makes his stomach churn, his hands sweat, and his heart constantly beat quickly. He becomes even more afraid, and still more adrenalin is released. In other words, he becomes caught in the fear-adrenalin-fear cycle."
"The constant symptoms are those of sustained tension and fear, hence their chronicity; while the different recurring attacks are the result of varying intensity in sustained fear, hence their periodicity."
and more
"The treatment of all symptoms depends on a few simple rules. ..... Facing,Accepting,Floating,Letting time pass..."
I think that what she writes is true for anxiety but also for the pain that often comes because we are unconsciously tense.
I hope you find it useful.