hello doc..im suffering from shortness of breath that comes and goes.along with it i had block nose and yes daily i used to get mild headache..what could it be..recently i have been diagnose with essential hypertension as all my result of all the test comes out normal.i have done whole abdomen ultrasound, deep renal study, LFT, CBC, fast lipid profile, and many other other blood test..what could be my problem??