The high pitch more than likely is the power steering pump. The least of your problems right now is the charging issue .
You need to do a hard reset if the green ready light is flashing your car won’t go into gear or run.
After you do the hard reset see if the ready light is still flashing if it isn’t then try putting the car into drive . Reduce performance usually is a HV battery problem . If you miles to zero have been dropping faster then before that will account for many of your problems right now .