Having nausea,disiness, i can hear my heart beats in my ear, feeling anxious at nights what coul it be? im feeling scared

Common-benign: Frequent complaint among normal citizens. If noted only at night then high likelihood this is "cardiac awareness", a benign condition in which one is simply aware of the heart beating. Oft times triggered by stressful stimuli, it will cause no harm. If racing rapid heart beats noted, on the other hand, then you should seek a doctors clinic care.