Hi. I Am A Long Distance Runner And Since More

hi. i am a long distance runner and since more than 1 month i am having pain in groin, hamstring and quads of right leg. pain is not at particular point in hamstring, it is moving to different location there but creating problem in running. pain usually feel less after 5-6 kilometer warm-up but since last two days it is very seviere and i am not able to move leg properly during walk also.
please not that i have already taken phisio and rest for a week twice in 1 month and it goes down during that period but it again comes when i start my training