Jo Jo -- one other thought -- do you have varicose veins? Have you ever had circulatory problems? Those things can also cause aching in your legs after exercise or even being on your feet for a long time.
I had bad varicose veins and chronic venous insufficiency (partly due to genetics and partly a lifetime of obesity). Though I've had the bad veins stripped out, I still get aching and throbbing in my legs after exercise (I was noticing how much my legs were throbbing just last night when I went to bed).
If this is a possibility in your case, you'd want to see a doctor for a treatment plan. Another helpful thing is to wear compression pantyhose when you exercise -- it reduces swelling and helps with the aching.
I could be barking up the wrong tree here -- just a thought ....
