needling pain!

My right should has always been bad. Well, not always, just ever since I dislocated in it college and didn't do anything to fix it.
Went to a shoulder specialist about 7 years ago who, after looking at x-rays of my should said "You are a very, very stupid man. Why didn't you go to the doctor when you did this? If you stress your shoulder seriously again, you will probably have to have surgery just to use your arm normally."
So, taking his advice like the genius I am, I continued to practice aikido and iaido.
Tonight at practice, whilst swinging the kilogram of razor-sharp steel that is my sword, I felt the most intense needle of pain bore through my shoulder. This was my body's way of telling me I shouldn't use arm strength to cut; very bad technique.
So I have a new motivation to pursue proper cutting technique; less important than the speed and fluidity of the movement is the desire to avoid putting too much strength into my shoulder which results in a red-hot nail of pain being driven from my shoulder into my very soul.