groin and outer knee pain

i started running about a month ago, and today i done my first long run of 8 miles, half way through the run, i got immense left groin pain and both outer knees pain, its now 8 hours on and i can just about walk, if i straighen my left leg when i walk its ok, i had perthes disease as a kid and am slightly worried, any info would be appreciated. 

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