Some of your statements are not detailed enough to lead to a conclusion -
ST-T changes may mean ischemia
, especially, if ST is down-sloping and is more than 1 mm deep at 80 milliseconds from J point.
A symmetrically inverted T wave
And so on - there are several technically related notes to decide. Again some ST-T changes may be from long standing blood pressure itself!
The best course of action will be to see the heart specialist as soon as possible - they will repeat the ECG / do blood tests (cardiac markers) and so on. After all the doctor and patient aim o prevent a hear attack first / reduce its severity and complications next. It is better to see now and here than wait and take a risk. Particularly so because of the age, blood pressure and cholesterol
Regarding cholesterol - the lab can give you an idea of risk ratio to help you to decide for the drug! The trend is to take it even the cholesterol is normal! - especially in the presence of any other risk factor like blood pressure.
) must be 80 mg - not 8 as you say!