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Funny enough, Ive had the same problem
My routine used to be:
Quads: - Leg Press 12, Leg Press 10, Leg Press 8, Leg Press 6, Leg Press 12 and Leg Extension 12
Hams: - Lying Curls 12, Lying Curls 10, Lying Curls 8, Lying Curls 6, Lying Curls 12, Deadlifts 12
Calves - Standing calf raiser 12, Standing calf raiser 10, Standing calf raiser 8, Standing calf raiser 6, Standing calf raiser 12, Seated calf raiser 12.
Ive been training since the beginning of may, and train legs once a week and every second week train them twice a week. Anyayws I got bored of the leg routine so I changed it like this:
Quads - Barbell Squat 12, Barbell Squat 10, Barbell Squat 8, Barbell Squat 6, Barbell Squat 12, Leg Press 12
Hams - Barbell Lunge 12, Barbell Lunge 10, Barbell Lunge 8, Barbell Lunge 6, Barbell Lunge 12, Deadlift 12
And with the second rouitne my legs were sore for days, it got a bit much , as I usually enjoy the pain - it makes me feel the muscles which I love, but this pain became so annoying. It passed over time and now when I try the second routine on heaver sets I get pain the next day but not unbearable
I think like me, you must have changed your routine and thats why your legs hurt so bad - its wierd I know but it passes - thank goodness