I would not drink milk before you run, though I have read that milk is the perfect post run food. Milk before a run is hard to digest and you don’t want all your blood in your stomach, you want it to be transporting oxygen to your arms and legs. I guess the 4-1 ratio of protein to carb is ideal post workout. I choose chocolate milk just to be sure I replace the carbs–ha ha! And get some protein–you are a little person, you need it. As far as calcium goes. Tums are ok, but getting a good supplement is much better. I don’t think tums absorb that well. I get coral calcium with vit D and magnesium. At your age and with the running you do a good calcium supplement is really important. I didn’t really take calcium until I hit 30 and I guess I missed my window of opportunity to store it and build bone. I have had stress fractures too; so don’t be like me ok? If your 10 miler went well, I think you should feel pretty confident for the race. Try to have a good diet and sleep from now until the race, but don’t beat yourself up about slacking the last week–everybody does. But the last two weeks you don’t want to be running on empty calories.