You know, I spent a few years in the Army, and I saw some incredibly physically fit athletes wash out of training while relatively average guys who you would never think of as tough or really in shape made it through just fine.
Real strength, and toughness comes from inside, and has very little to do with physical strength or size. A will to win, and the ability to endure come from your head, and heart.
Anger can eat a person up inside, so it's good to know that you have a way to get it all out when it threatens to boil over. I have alot of anger too. Anger at this disease, anger at the unfair feeling of "why me", and anger at people who I thought would understand and help me, but didn't. I can physically feel it in me, my stomach churns, hands shake with adrenaline, it's no fun, and Lupus loves the stress of the anger and gives me a nice flare as a gift for it. You have every reason to be angry, you are right handed, and this procedure is on your right wrist-that's incredibly unfair. You take pride in your excellent handwriting, and now this is going to mess with that ability-it just plain sucks.
But, I believe I've known you long enough to say that it's going to take alot more than this to beat you. You ARE strong, and you can, and will face this. And you will win in the end.