You have lots of things it can be related to.
sleep apnea, allergic rhinitis, sinusitis, GERD, deviated septum
This explains why...
http://doctorstevenpark.com/the-biggest-ear-problems-for-sleep-apnea-sufferers
It's also associated with hypertension
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5050200/
and the use of diuretics to lower blood pressure and you're taking a diuretic which is the HCTZ (Hydrochlorthiazide).
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4003803/pdf/main.pdf