The downside isn't really injury, fear of injury or the process of fighting back from injury. The downside, the very worst thing in the world, is surgery.
The only way to get back the confidence is to play and win matches. You can practise as much as you like, but you need confidence that comes from playing and winning matches.
You can't really describe how difficult it is to deal with. It is any athlete's worst nightmare to be accused of cheating by taking drugs. It really is very difficult to put into words how it makes you feel.
You do it for the highs, when you're totally engrossed and everything's flowing and whatever you want, you get. It's like magic. That's why you play the game. That's what it's for. That's why you work.