Given your history of mitral valve prolapse and SVT, these short, self-limiting episodes are most likely brief runs of SVT or harmless extra beats from the upper chambers of your heart. To accurately differentiate them from ventricular tachycardia, atrial flutter, or atrial fibrillation, a wearable heart monitor (like a Holter monitor) is needed. These conditions look distinct on an ECG. I recommend consulting your doctor, who can determine if adjusting your atenolol (Tenormin) is appropriate.

Your current readings of 130-135/80-85 mmHg fall in the mildly elevated range of hypertension, but they are not usually considered dangerous, especially if you were previously around 110/70. Small fluctuations can happen due to stress, diet (salt intake), poor sleep, or measurement timing. Since you are already taking multiple medicines like Tenormin, Metocare, Amlodipine, and Enapril, it is important not to change doses on your own; instead, monitor your blood pressure regularly at the same time each day, reduce salt, manage stress, stay physically active, and ensure good sleep. If readings stay consistently above 130/80, or rise further, consult your doctor to review your medications and rule out causes like lifestyle changes or medication timing, but overall, this level is usually manageable with proper follow-up.