Plagued by injury

failed to complete my planned 30km today, due to excrutiating pain that i felt on the outside of my left leg. Could feel the slight strain on the leg when I begun the run, but it was still okay. At the 7km mark, the pain was horrible that I couldn't bear it any longer. Had to stop.. After resting a while, tried to run again, hoping that it would go away, but it just won't. Limp back to Downtown east area, and thankfully, i always carry $1.50 with me, so as to buy drink at the end of the run. So took bus 21 back. now, even walking hurts. Don't know if it's ligament issue or muscle strain. Either way, it's just bad. Even worst that SCSM is 3weeks away only. Sigh... Now can only hope that it'll recover in time.