Thank you for the information,
High blood pressure itself does not cause frequency of urine unless there is any kidney change.
Increased frequency of urine with high blood pressure is often seen as an effect of medicines.
Diuretics or water pill, alpha blockers can be factors.
Other factors for increased frequency can be enlarged prostate(excluded already) , urine infection, diabetes(excluded already), excessive intake of tea,coffee or alcohol , congestive heart failure, obstructive sleep apnea
I hope this information helps.
Happy to assist, if you need any clarification.
Please feel free for any follow up query.