Welcome to HCM,
I have gone through your history in detail,you are diabetic for last 30 year, if frequency of urination is more when blood sugar level is high it is due to diuretic
action of high blood sugar level and dryness is due to dehydration
and you take more water which in turn will lead to urination in night.
Other possibilities as you are diabetic for 30 years is early Nephropathy you should do a kidney function test and albumin in urine and urine R&M specially specific gravity and urine concentration test.
Your age is 55 so there could be Benign prostate
enlargement so get your Ultrasound
done to check residual urine and PSA.
Please also get your cardiac check up and any signs of heart failure
may be checked by 2 D Echo cardiography.
Keep your blood sugar control to optimum level and monitor by FBS and PPBS along with HbA1c at 3 month interval.
Please discuss with your Physician and consult Uro Surgeon if necessary.
Take care good Luck.