It is necessary to determine the cause of the pressure rise. Most cases of hypertension are due to age-related changes, which is unlikely in your case. In young people, high blood pressure is often just a symptom of another disease. A physician or cardiologist, if attending a young person with high blood pressure, will first of all look for those diseases that can give hypertension as a symptom. It can be kidney disease, different zones of the adrenal glands, thyroid gland, vascular inflammation, congenital connective tissue dysplasia. Also taking medications, drugs (cocaine, amphetamine). You probably realized that it's time to see a doctor
Of course, since you associate it with stress, it may be due to stress. But getting rid of the stressful situation would be nice anyway. You can also contact a psychotherapist
The heart is a very important organ and you shouldn't risk it. It would be necessary to do a cardiogram, if everything is normal there, then simply - stop being nervous) You can drink a course of valerian, it should help. But go to docdoc.ru to a cardiologist.