Why are my symptoms of hyperventilation returns again when i stop taking escitalopram?

If the hyperventilation is due to anxiety, this needs treatment. So, seek counseling for the anxiety from a psychologist. You can take the medicine at the higher dose to get the symptoms under control while you are being counseled. Once you are taught alternate ways of dealing with the anxiety, then lower the med dosage with the intent of stopping it if the symptoms remain resolved. Good luck!

Because hyperventilation is the main symptom of the panic attack for which escitalopram is prescribed. Take care.