Help, need advice about ankle?

About a month ago, i was as a water park and I fell pretty bad. There was a serious pain in my achilles tendon on my left ankle. I gave it about a week, and all seemed to be good. A week later, when I started water polo up again, it began to hurting and getting worse by the day. 3 days after starting water polo up again, it started bruising, and thats when my mom decided to take me to a orthopedist. He diagnosed me with Achilles tendonitis. My physical therapist then said she thought it was just a 2nd degree sprain. Im on anti inflamitories, but it still hurts pretty bad. What should I do?????