how do you find a good doctor?

any suggestions? ive been having some pain in the left side lower back, left hip area, left side of groin area, left thigh and hamstring, and left knee. i can still ride and do most anything, but this stuff is a nagging ache all the time. i went to a couple chiropractors and one orthopedic doc, they cant find anything. im 33, live in va,usa. i dont think these docs knew what they were doing, how do you find a good doc?
thanks

yea all on the left, i just had some more x-rays ,they said looked ok. currently scheduled for mri of back and left leg