lindsay- I too work in fulltime in retail and spend 95% of my shift standing up and im already getting the worst back pain and ive almost passed out once.. i was seconds from fainting and my mum told me that my body is telling me its too much. But being so close to christmas my work cant afford for me not to work fulltime but as soon as christmas is over i am cutting my hours down by half and go casual so i earn roughly the same. And yeah i heard that the 'cramping' is stretching and growing pains but my god they dont feel lke it