1) avoid the creatine...just bloats you up with water weight.
2) STRETCH more...and more
3) run intervals and skip the long distance. look up 30/30 routine
4) read here
5) if possible, find a running coach and get them to look at your stride. A little bit of feedback and tweaking can save your kness and other joints from permament damage.
6) get on a good meal plan. (not diet) Eat right = better performance