If your head is thinking too fast, be it from worry, anger, or anxiety, Aquamarine may be the best stone to help you chill out your mind. If you are the type of person who overthinks things especially in a hurried way, then Aquamarine may the perfect stone for you to help calm and chill things out. Aquamarine does have a very watery, cooling energy to it. So if your mind is "overheating"... and especially if your mouth is overheating too, being overly garrulous with sharing or expressing your feelings then this is the perfect stone for the energy of a cooling shower for your throat and mind.
This crystal would also be deeply helpful in helping those with underactive throat chakras begin to more easily express themselves. The water resonance of the stone helps energy to flow more steadily through the throat chakra allowing for easier freedom of expression.