If you are experiencing loss of color around the mouth, including "blue or purple lips" you will need to see a doctor immediately. A purpling of this region indicates poor blood flow which can be caused by a myriad of reasons, some of which are dangerous.
Take care.
Palpitations are the sensation of feeling your own heartbeat.- not sure you can change that...
Dry mouth may be helped by hydration.
As for purple lips, not sure. Probably depends on the reason for the change in color.