Anyone else a cna & having trouble with work?

Im finding doing my job more & more difficult as time passes....I'm now 28w2d & it's seriously taking a toll on my body I'm cramping, feet are throbbing & swollen, back is shooting with pain as well as the sciatic nerve shooting into my bottom, out of breath, hot flashes when I bend if I can even get down...the list goes on, I felt good for my son yes norm preg feeling but I don't recall having so many aches & being this uncomfortable this early on... It's a struggle especially to stay on my feet for an 8hr shift. If & when I get a chance to sit it's like heaven, I'm not one to wine or complain a lot never was my nature but I just need to know is it me or what!?