T.M.
I have a kidney disease that is called IGA nephropathy. It causes me to have high blood pressure. One of the meds that i take is a dieuretic. That is what the lasix is. It is too help flush out the fluids (salt) which should lower the BP. This is how is understand it anyway :)
My advice is to see a nephrologist (kidney dr). I wasted my time with urologists for many years. They could never figure out what was wrong with me. I would have him watch his salt intake in the meantime. Does he ever have dark urine? (coca cola colored)
I hope you figure this out soon. High blood pressure is not fun. I get the red ears and funny headaches too. I hope i helped a little :( Please feel free to message me if you have any questions.