Various organizations including the United States Department of Agriculture recommend that Americans consume less than 2,300 milligrams (mg) of sodium per day. But the ideal limit is really no more than 1,500 mg per day for most adults. Unfortunately, the average sodium intake of Americans is more than 3,400 mg per day, according to the Centers for Disease Control and Prevention (CDC). This is partly because sodium is so easy to consume — just 1 teaspoon of salt contains 2,300 mg of sodium.
If you are dissatisfied with your current nephrologist, you need to either persistently and politely keep asking for more help and more of what you need (e.g. more explanations), or you need to try a different nephrologist. I’m sorry as doing this is a lot of work, but unfortunately, it does sound like you need to work closely with a health professional.
I would not recommend changing BP medications every 3-4 months just to prevent the onset of potential side-effects, but it certainly makes sense to reassess how you are doing on a BP med after a certain interval (usually after a few weeks, and then every few months or more often if the dose still needs to be refined or if there is concern about potential side-effects).
Kiwis are another fruit that positively impacts blood pressure. Some researchers studied how the fruit fares compared to apples. They found that eating three kiwis a day over eight weeks reduced blood pressure in people with slightly high blood pressure more so than eating one apple per day during the same time. A daily serving of kiwi was also found to reduce blood pressure in people with only mildly elevated levels. Kiwis are also an excellent source of vitamin C which can also also improve blood pressure.  
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