Seeing your general physician, who will probably give you painkillers and anti inflammatory drugs and recommends resting the joints for many weeks. May also offer supportive strapping, seeing a good sports physiotherapist as soon as possible. There is usually one based at or affiliated to major sports or health clubs; word of mouth is a good way to find a reputable sports physio, but in the other places you can also try the sports injury clinic, consulting a general physician would not cure your strain injury, it can only be cured by the treatments given by a sports physiotherapist.