I think you misunderstood the comment about vitamin c being a precursor to creatine by a previous poster. While it's true that phospho-creatine at the cellular level aids in the creation of ATP, which is our primary source of energy for muscle contractions, I think you're probably taking the supplement creatine monohydrate. It's the stuff bodybuilders use to increase strength and won't do much for recovery or endurance performance, and will probably impair endurance and your power at threshold. (donning my flame retardant suit for the pro-creatine onslaught)
Also, I think the idea of a post-workout recovery drink is not really to have a drink that's high in protein, but to consume something with plenty of carbs that can be absorbed quickly...ie, high glycemic index, to replenish the glycogen stores you used when you were riding. Adding protein to the mix is supposed to aid in glycogen synthesis. There are some pre-mix drinks out there that have the recommended 4:1 carb/protein ratio that is supposed to be ideal, or you can do what I do and take a couple cups of orange juice, add a handful of frozen blueberries, a handful of frozen strawberries, some vanilla flavored whey protein powder from Trader Joes (or maybe some plain lowfat yogurt), and maybe a teaspoonful of glutamine powder, throw it in a blender and voila! Instant protein recovery drink, and tastes awesome too.
As for protein, you just need to make sure you're getting enough in your daily diet, which isn't close to being a problem for the average American unless your a total vegan soy boy weirdo.
Didn't read the other posts that closely, but complete rest is really important. I think Wyoming Dave probably has that covered. His posts are really good.
Good luck.