If you're concerned about your blood pressure it's worth getting a blood pressure monitor (choose a type that's listed by the British Heart Foundation or the NHS). Just being in a doctor's surgery or hospital can cause "white coat hypertension" and it doesn't take tensing up much to add ten or twenty mmHg to your blood pressure (1mmHg isn't much pressure).

If you can test at home and take an average over a decent amount of time, then it will give you a much better picture of what your BP actually is, and whether there is a problem, and if there is a problem, if what you're doing is helping to fix the problem.