If you had recurrence on a dose, which you are sure was not missed then your dose can be increased if tolerated. Beyond medicines, there is option of radio frequency ablation which is an invasive procedure in case of recurrent episodes.
So far , no medical journal says the any antihypertensive medicines will cause BP to fall below to lower than normal level . Your BP is staying at normal level As a result of the tablet and should not stop it . If you stop BP will shoot up if you have hypertensive disease
There's nothing safe or unsafe as such. If you have a condition for which a particular medication is necessary and its discontinuation may cause harm, then you have to continue it. Lifelong or not depends upon your condition. However if alternative safer medication can be given for your condition then you may choose one after consulting your doctor.