Just out of curiosity...have they checked your thyroid? I'm asking because I have hypothyroidism, and my blood pressure was running higher than it should have been for my age. I used to run really low, and like you, I eat really well. So both my doctor and I were confused as to why my BP was high.
Well, it occurred to me that having two parents with hypothyroidism meant I should get it checked as well. Sure enough, it was low. I went on medication, and my BP went right back to where it should be. I didn't really have any other symptoms; I just thought, "Hey, I should check this" and that's what it was. Now we know if my blood pressure starts going up, we need to check my thyroid.
It's a simple blood test, and it might not be it, but if your meds aren't working and there's no lifestyle changes you haven't already made...might be worth getting it checked. Or it could be something else underlying.
Of course, you'll want to look at the other symptoms, and if you have any of them, let your doc know so they'll know to perform the test. Some are stubborn. For me, family history was enough, but you never know.