Cause of my Diziness. My problems?

Hi Doctors, Its been complete 3 months now and I daily feel lightness in the body like if my body has suddenly become energyless. This dizziness comes in episodes, i mean like after noon then again after 2 hrs, then everthing will be fine for nearly 4 hrs and then suddenly again this damn dizziness. P.S.:- I experienced my first anxiety attack on 14 june and since then I m on medications. I daily take Petril Beta 10 twice along with Olmezest 20 mg. Olmezest is added 2 months back when my blood pressure was found to be 144/94. I had numerous ECGs and all were normal. Did undergo TMT two times and that too came normal. Stress Echo and Echo both normal with Ejection Fraction = 60%. Blood tests also came back normal. KFT was also Normal. Hemoglobin = 16.3. Then Please doctors suggest me why this dizziness is not getting cured. Is Medical Science failing to identify my problems? From the past 9 Months , I have been checked my more than 3 doctors. I really need a solution.