Hello from JustAnswer.
Worsening nocturia of high volume can be from conditions that increase the volume of urine overall, and the most common of these is diabetes. Diabetes will usually cause increased urine flow during the day, as well, but people may not notice it as readily during the day and at night when it is waking them from sleep.
Nocturia of high volume also can be related to any condition that causes fluid retention. During th day, the retained fluid will tend to be pulled into the lower extremities because of gravity. When sleeping and lying down, there is no longer the pull of gravity, so the fluid will distribute throughout the body, increasing blood flow to the kidneys and increasing the production of urine. There are many conditions that cause fluid retention, and the most common is from heart dysfunction or heart failure, but also can be related to liver or kidney disease. Since you have a history of hypertension, there is an increased risk of heart disease and kidney dysfunction.
It would require a proper evaluation to determine the specific cause. There are over the counter devices to check blood sugar, and while it is usually not worth buying one if you have not yet been diagnosed with diabetes, if you have a family member or friend with diabetes, you might be able to check your blood sugar before seeing your doctor.
If I can provide any additional information, please let me know.