Symptoms: break out into a cold sweat, hands start shaking, feeling of faintness, heart races. Out of theblue onset of symptons?

Check blood sugar. I would first have my blood glucose level checked, these signs are consistent with hypoglycemia (low blood sugar), but can also mean other things, but first thing's first. Next i would have a cardiac evaluation and this would include an examination of your thyroid function. You should see your primary care doctor soon.