I am 42 years old. My BP reached to 150-100 near period and remained 140-90 for the whole weak. Also palpitations and breathing problem occur on first day (since 3 years). My doctor told that it is tachycardia. ECG normal. Changes in V3 (every time when checked). My doctor suggested me CONCOR tab for BP. Is tachycardia harmful? Whenever it occurs I feel much uneasy. My 2D Echo is also normal.