Work while pregnant

Anyone else a nurse? I work in a recovery room and spend the whole day on my feet. I have been having terrible dizzy spells, constant nausea, and extreme tiredness. The nausea is so bad, I have gagged in front on patients while I have been helping them. I’m 9 weeks and have called in sick once already. Sometimes these long shifts have really just exhausted me and I had to leave early one day. Anyone have any advice?