Ice it and do gentle stretching and massage but not all at the same time!

Be sure not to ice and stretch at the same time. Actually, I would not even try to stretch it for a day or two. I recommend heat, not extreme heat, but keeping your leg protected from cold, and protecting it from further injury. You can also take ibuprofen for 24–48 hours to reduce inflammation. 2 to 3 (400–600mg) every 6–8 hours or so. Just be sure not to take the reduction in pain while medicated as a false sign you are healed and injure yourself more. Also, take ibuprofen with some food and a glass of water.

Rest, ice, compression, elevation.