That's a toughee MLC. Still, you knew you'd get setbacks, everybody does. You'll still get there - your determination to succeed springs out from every post you write!
One solution I've heard about but never tried (when running) is to tape the section just below the kneecap (Nadal does it a fair bit). This is supposed to support err..something and lessen the shinsplint pain. Maybe worth a go. (Won't make you a better tennis player though...)
I used to do it sometimes in my yoof when playing volleyball - certainly helped me although I never got a diagnosis of what was wrong, a mate who was studying sports science recommended it though when I described the pain I was getting.