It is best to slowly get off meds since your body has become accustome to them. Yet if its been 3 weeks and your Blood Pressure is normal I would say you are fine. Working in a pharmacy I see this often, but you should be fine.
I was on BP pills for 4 yrs. I am not on them anymore. I was once told once you are on them you are on them for life. My dr took me off, but my bp is still high.
When my husband was put on blood pressure pills they gave him a booklet on ways to lower it. The main reason his blood pressure was high was because of his job. Now that he has switched jobs his blood pressure is down and is off the pills. If you can get your blood pressure normal and to stay normal there is no need for pills they will make you sleepy and drowzy if your blood pressure is tooo low.