I have anxiety. Today I had a panic attack. I'm used to high HR, but for some reason my pulse was only around 70-80, plus no palpitations. Strange?

Not as common. Hi Hugo, 70 to 80 is not that low, but any concerns about your heart should be discussed with your doctor. Generally, a fast heart rate is a common symptom of anxiety. It is possible, but not as common, for heart rate to slow down during anxiety. During emotional stress, your vagus nerve can become excited and slow down your heart rate and blood pressure. Consider CBT to manage anxiety/panic.