Dennis, you seem set that you are changing to the new doctor practice, and both doctor and NP do seem supportive of controlling BG through diet. So on the nothing ventured method... call the office to see if you could 1. speak to the NP on only your one specific question (would Kidney damage occur at x average BP for 3 months..is it safe to wait?), 2. could you complete their new patient /med history forms now to get a file (including your home BP readings) in place, and finally, get on their wait list for last minute or any earlier openings. They will likely say can't advise over phone until have seen you and you are their patient, but be clear you will accept it as general advice while waiting.
You may find their practice does not prescribe diuretics or not until BP is consistently over 160/100.
You know your body better than a doctor, if you felt "loopy" on the med..it was not a coincidence. (See Dr Davis new book excerpt post in Media forum) Diuretics mess with electrolytes, low potassium is a known issue, and maybe combined with your lower carb diet, you felt side effects someone on a HC diet wouldn't.