Working while 6 week pregnant

I am only 6 weeks pregnant and having terrible sickness and nausea throughout the day. In addition, I am suffering from excess saliva production so I have the need to spit constantly. All these is bringing inconvenience to me while I work. I work in a lab setting so it's really affecting my job. I can't be taking leave till I finish 1st trimester. What can I do to help me get through this phase? I'm actually very sad and cry constantly