Experiencing throat discomfort and 'tightness' when lying down at night. throat makes gurgly noises sometimes too. any idea what this could be?

2 possibilitres: At night in a supine position, you may have significant post-nasal drainage from your nose or sinuses (rule out allergy). A second possibility is gerd. That is, reflux of acid from the stomach, so called LPR (laryngeal-pharyngeal reflux. The reflux of acid can go from the upper esophagus into the throat and cause your symptoms. See and ENT doctor.