You could be overstressed but that would not cause gurgling sensations. Although you feel it in your back, it may be coming from your lungs. This raises the question of a problem in your lungs due to the
bronchitisAcute bronchitis
Bronchitis
Bronchitis and normal condition in tertiary bronchus
Cause of acute bronchitis
Cause of chronic bronchitis
Chronic bronchitis
Croup
Industrial bronchitis you had 2 years ago, such as bronchiectasis.
It could also be coming from fluid in your
esophagusBarrett’s esophagus
Esophageal cancer
Esophageal perforation
Esophagitis
Esophagus
Esophagus and stomach anatomy, where it doesn’t belong. You probably should have your esophagus checked for evidence of reflux and impaired contractility. It would be important however to be sure that mucus isn't dripping from your sinuses into your lungs.
To summarize, you need to have your esophagus and sinuses checked out before concluding that the gurgling is coming from your lungs.