This started in Nov 2013, for the first time I started taking dumbbells for exercise. I didn't know the weight to start so I took 20 kg (10kg in both hands). Within a week of exercise, I felt shortness of breath and so I stopped doing it and went to see a doctor.

He told me to take ECG and it came out normal but had higher pulse rate. When he checked my bp it was also high like 140/90. So he prescribed Nebicard 2.5 one tab per day morning and it brought down my heart rate and BP. 

Since then I am not able to work harder and when I do something then excessive sweating and higher pulse happens. So I went to see a cardiologist and he asked for an echo test. 
It was taken lying down and he told there is no problem but I have a Bicuspid Aortic Valve. He told to continue with Nebicard and take echo every once in a year. 

But even today I have symptoms like higher pulse and I can feel the heart beating hard when I touch the chest wall. Also when I stand up suddenly my heart rate first increases and then decrease after 7 seconds and I have sweat, Sometimes this is accompanied by breathing difficulty. This stops to normal after 1-2 min. This is happening to me since Nov 2013 and still going on. 

What is wrong with me, is BAV causing this or what test should I take now. 
Should I take stress Echo test?

Note: I have done all blood tests, thyroid tests, kidney Doppler. All are normal.