Heart rate went high?

This happens to people all the time. For example a delayed stress response, your body can release adrenaline after stress, not during it. Feeling mentally calm does not always mean your nervous system is calm.

You can also have an anxiety spike without anxious thoughts, which is especially common with health anxiety or OCD.

Position and movement matter too. Standing up, shifting around, or even tightening your arm can raise your heart rate.

Other common factors include caffeine, dehydration, poor sleep, pain, or muscle tension, and neck, jaw, or TMJ tension absolutely counts.

Since your heart rate was higher, it makes sense that your diastolic number was higher as well.

Diastolic pressure is very sensitive to stress hormones and muscle tension. A temporary increase is not dangerous, and the systolic top number is more important.

Slow, steady breathing can help bring both numbers back down.

This happens to people all the time. For example a delayed stress response, your body can release adrenaline after stress, not during it. Feeling mentally calm does not always mean your nervous system is calm.

You can also have an anxiety spike without anxious thoughts, which is especially common with health anxiety or OCD.

Position and movement matter too. Standing up, shifting around, or even tightening your arm can raise your heart rate.

Other common factors include caffeine, dehydration, poor sleep, pain, or muscle tension, and neck, jaw, or TMJ tension absolutely counts.

Since your heart rate was higher, it makes sense that your diastolic number was higher as well.

Diastolic pressure is very sensitive to stress hormones and muscle tension. A temporary increase is not dangerous, and the systolic top number is generally more important.

Slow, steady breathing will help.

You need to get to a doctor and have a good cardiac work. Yes, stress can make your blood pressure go up and affect your heart. You wanna be safe and make sure it is just stress.
Wish you the best

It might have been a short run of what is known as 'supraventricular tachycardia,' (SVT), or ventricular tachycardia. Either way, it's likely a short run of tachycardia, meaning fast heart rate, and it is a form of arrhythmia. It needs to be checked out.

Paroxysmal SVT and atrial fibrillation are the early stages, and that's when it's most easily controlled, often just with medication, although sometimes lifestyle changes can help as well. You don't want this to progress, but it tends to over time. You'll get longer and more frequent runs....maybe...not absolutely, but it tends to for most patients. If it goes too far, you have to their live with it or get a pacemaker. So, don't let it go too far before you get professional assessment and interventions. There are several, and they work pretty well most of the time.

@gloaming When I was in my 30's I experienced a frightening episode where my heart began to race and I actually passed out for a few seconds. Afterwards I felt exhausted, as if I had just completed a marathon or a high intensity aerobics workout. I went to my Primary Care doctor, who then sent me to a cardiologist. The cardiologist ran some tests and determined that I have Mitral Valve Prolapse (MVP) with reflux/regurgitation. (I found out later that mine is most likely hereditary, my dad had the same problem.) The doctor explained to me that my mitral valve is "floppy" and doesn't always close fully, allowing blood to leak backward across the valve. What happens in some instances, the heart senses that there isn't enough blood flowing and beats harder to push more blood, the blood keeps leaking, and the heart beats even harder. Fortunately, my MVP is treatable with medication. I am now 71 and haven't had an episode like that for many, many years.