Will this ever end?

I have no idea how anyone goes through this more than once...I have never, ever been so miserable. I have already missed two weeks of work and now I am being told I should take off another week which is impossible. I am a nurse so I am on my feet constantly for 12.5 hours a day. I can't imagine working with how I feel, but I feel awful to have to ask my manger for MORE time off.
I am getting winded walking less than 20 feet - prior to IVF I was in shape and petite - the IVF nurse said that with me being small it makes it more difficult on my body at this time than it would a larger woman because there is just nowhere for any fluid buildup to go except out and up towards my chest. My abdomen gets more distended (sticking out and harder) as the day goes on, so I thought it was possibly gas - she said it is fluid. I don't know what to do. I can barely eat (I feel full, I guess because my stomach is squished with fluid) - but I am drinking lots of gatorade. This is just so mierable and stressful - I thought once the ER and ET took place my stress levels would decrease...wrong again!