Morning sickness and work!

Hi ladies, just wondering if you can advise me on what to do about this flipping morning sickness... I'm roughly 10 weeks, not 100% sure yet. But the nausea is horrific, I'm only throwing up first thing of a morning and once in the afternoon but the nausea is constant. Nobody in work knows about my pregnancy yet, my bump is poking through my jeans and when they notice im puking and ask what's wrong I don't know what to tell them. I don't feel it's getting any better and as I'm a receptionist, I can't really keep hiding this much longer .. any advice?! 

Thanks you lovely lot! X