How To Keep Blood Pressure Under Control?

Hi doctor..am facing the bp problem last 3 months..am 28 yrs old..there is fluctuation in my bp..when I went to the doctor they told me its 154/96 and the prescribed for me losartan..buti didn t take..when I reach home I measured its average 140/86..now am drinking hibiscus extract tea..now while am measuring its shows average 136/85..do I need to take the medicines..or shall I continue to drink tat hibiscus extract tea..is it safe to drink tat tea for life long..now I feel little bit burning sensation in my throat..and am eating garlic clove also everyday..and going for walking 20 mins everyday ..