pinkpixies,
According to the 7th report of JNC treatment guidelines, blood pressure of 120-139/80-89 is pre-hypertension and should be treated with
lifestyle modifications. The European guidelines recommend pharmacological treatment at 140/90mmHg in all hypertensive patients. The threshold for drug treatment is lower in people who have a higher cardiovascular risk, such as diabetics, post-stroke, MI, people with renal dysfunction and protenuria.
Because of you are leaking protein, your nephrologist wants you on the ACE inhibitor. This drug will reduce or eliminate the protein leakage, depending on the cause. Besides helping protect your kidneys, it will also lower your blood pressure. I'd suggest taking blood pressure readings using a home monitor for several days, then reviewing the results with your physician. If your blood pressure is 100/60 without medication, you should not need any blood pressure lowering medication. Watch for excessive reductions in blood pressure if you are already taking this drug.
If your blood pressure becomes too low on the medication, demand a dose adjustment. I hope your doctor will closely monitor your progress and your blood pressure. You should ask your doctor what your treatment goal is. I know you have been eating healthy food and watching your salt intake. That's great.

The lifestyle measures that are recommended for preventing or improving hypertension are: losing weight -5-20mmHg per 10kg weight loss, DASH diet -8-14mmHg, dietary salt restriction -2-8mmHg, exercise -30min 4-5times a week- 4-9mmHg, and reducing alcohol intake to 1-2 drinks a day -2-4mmHg. I can understand your anxiety when the doctors start talking about losing weight, which seems to be the "recipe" to better health, no matter what the problem is. I'd be really annoyed if my doctor kept reminding me to lose weight. Most of us need to increase our calorie output, since we already eat a very healthy diet. It's pretty basic..easier said than done.
flowergirl