I keep rolling my ankle and have pulled a muscle in the back of my leg, running Cross Country. WHAT SHOULD I DO? Can you help PLEASE? PLEASE help!

First you need to give that ankle a break, lay off for a week or 2 ( If it still hurts after a week) then you need to start working on some ankle exercises, you can look some up. My favorite are single leg balance for a minute, 4 sets twice a day, calve raises, and then get a brace or sleeve for a month. Now that pulled muscle should also be rested for about a week, while you are also resting your ankle, and raised with 2 pillows and iced( do not heat, it will not do you good at all). Take some ibuprofen and get some compression pants. after 3 days of that you will continue doing so but also implement stretches for that back of your leg which is probably your hamstring.