What does it mean if your leg has been hurting for 2 months now?

ever since I've been working, I'm on my feet 8 hrs a day and my left leg hurts a lot, the muscle aches and now the calf is hurting too, my right leg is fine too, and of course my feet hurt but why is only the left leg hurting?

i have an appointment for xray but its not till next week!

anyone experience this before? do I have an athletes leg?
What does it mean if your leg has been hurting for 2 months now?
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