Glad he's doing better & sticking up for himself now, I can see why that would worry you still though, but bullies are generally weaklings trying to prove themselves otherwise, & really don't like picking on people who will stik up for themselves, so I expect he's turned a corner & will be okay now, he'll no doubt feel really empowered by it, which will put him in good stead for growing up & knowing how to stand up to difficult people,...... must be hard for you though :( but its unlikely you'll need to worry now....., we were lucky, after a battle DDs problem was finally expelled & the other left, thankfully she too stood up to them in the end & its really helped her come to terms with it all :)
Your kidney problem sound similar to mine, & my kidneys weren't the route cause of my high BP, initially put down to the type that can just happen on its own when we get older, though due to other health problems flaring up, they are now looking at my parathyroid
& the ACE inhibitor BP meds do help your kidneys, though I personally didn't get on well with those, eventually found 1 I do get on with & despite high BP not being meant to have any symptoms I've noticed the drug actually helps with all sorts of things, so you might be pleasantly surprised...good luck on Wed :)