Bluecloud,
As a smoker, nicotine stimulated your brain to release neurotransmitters responsible for good mood. Now that you've quit, especially if you've recently step down to a lower level of NRT, your mood takes a nosedive.
Rest assured this will pass but until then, be kind to yourself and do anything that may help make you feel better.
Hang tight.
Danielle, Bilingual Support Specialist