Hello and thank you for using HCM. I carefully read your question and understand your concern. You should not worry, i will explain you somethings. We talk about hypertension if we have mean values that exceeds 140/90 mmHg. A person might have high values after a physical or emotional stress so it is important to judge in mean values day and night. Normal heart rhythm ranges between 50 to 100 beat for minute. There are some heart rhythm issues like tachycardia, extra-systolic beats or arrhythmia like atrial fibrillation that might cause palpitation, skipping beats, cramps sensation in heart, chest discomforts or difficulties in breathing deeply. This might be sporadic this is why your electrocardiogram might be normal. The causes might be different to simple stress, excessive coffee , alcohol consumption or pathology like anemia,hyperthyroidism, ischemic heart disease. So, if I was you treating doctor I will ask some examinations. A cardiac echo to evaluate heart valve and walls, a pressure and rhythm holter monitoring to evaluate this parameters during day and knight. These helps us to have a full view and diagnose hypertension or rhythm problem. Also, a full blood check up, your thyroid hormones and an abdominal echo to evaluate renal structure. After this we can know the cause and how to treat the problem if it is any, Hope I was helpful. Best regards.