my heart problems.

in December 2007,I was taken into ER in UCH London puffing and blowing,feeling dizzy sick and ill.
various tests were done like,CAT chest scan,stress test,echo cardiogram,24 hour tape test all were reported as normal.(a doctor even rang my GP to ask him if I was a mental case!.
then one last test a myocardial perfusion scan showed mild ischemia  affecting the Apex, basal lateral and basal septal regions with preserved LV function.

Great now who is the nut?.....
I'm still suffering nausea and dizziness with breathlessness.
on a good diet and trying to lose weight.non smoker non drinker/cholesterol is within my labs high normal range.
BP 126/81 .
Recently had CT angiography that showed no CAD at all,however had a tachycardia attack  on 6/11/08 130-140 bpm.
on Statins and Aspirin,but refused Nitro tablets for Angina attacks as they give me bad headaches(and Low BP).