Your heart function has reduced from 45 to 36%, and also you have ventricular ectopics, it can either be that you had another heart attack
or the stent
got block, which has caused heart function to decrease. Also these ectopics indicate that probably you may be intermittently having unstable heart rhythm which explains your giddiness. This is pretty serious, a check angiogram should be done, with a 24 HR holter. Further treatment will be based on the reports of these tests.