Thanks ladies I appreciate your responses.

MD, I have just finished AF a few days ago so it's not premenstral. I haven't really taken notice of when I get it though so I don't know if it's related to my cycle.

I was kind of thinking people would say 'it's just because you're on your feet alot, sit down and relax more' , lol!! I didn't really think about the possibility of it being something more serious! I will go to the doctor when I get a chance.