Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

i don't have the inside info on your case, but i've had so many chest pain scares that i quit going to the doctor for them. in my own case, anxiety management exercises proved the far more effective fix. they are cheaper and more fun, too.
Medically, you checked out. Mentally, emotionally, and brain - you know you're feeling 'off'.
Take a deep breath, relax, and then use the stop, pause, breathe, option, repeat until you feel calm.
It takes time to find the calm naturally after an episode of anxiety's help such as you experienced.
You're not alone in this.