Let's get the facts clear
1 you do not have any hypertension. Even if your family doctor took your readings a dozen times over a month the fact that you get off and your blood pressure is normal proves this. There is no blood pressure illness that comes and goes. A raised reading due to white coat or running up the stairs is not hypertension. NASA regularly got over 300/180 on crews at launch
2. A family history is irrelevant. There is no such thing as a little blood pressure. Your readings are normal.
3. There is no reason for the regulator to deny a medical as you have had no illness. A doctor Inappropriately gave you a drug you didn't need and you became hypotension. That is good as it shows you have a normal response
4. Your problem is you can't say you have never been on the drugs. You must get your current doctor to stop this 'bit of blood presure' nonsense and give you a letter saying you do not have hypertension, did not need medication, and the other doctor was wrong. I regret this will not be easy and you may need help from your forum BUT it will be easier to get your doctor on your side as opposed to another doctor fighting them