Nauseated All Day Long...

Is it normal at 6w3d to feel nauseous all day long....I haven't thrown up (came close 4 times), but I have been nauseated all day, with no breaks of feeling "normal". I have to return to work tomorrow (as a dental assistant) and am starting to worry about how I can pull off my job. I am at the doctors side all day dont know what Ill do if I have to throw up :( Food isnt helping, but its definitely worse when I start feeling hungry. I never thought that once I became pregnant Id feel sick all day long. I figured maybe a little in the morning and then a little in the afternoon....Im kinda freaking out...