Help hiding these awful symptoms?

I'm 32 and due the 21st of June. This is my second although my son is almost 12 so it feels like my first time around because it's been so long! I had a fairly easy pregnancy the first time and this time I am feeling awful :( it's really hard because we aren't even telling our families until 12 weeks and I don't want to tell my work until after the new year. Any tips for hiding this never ending exhaustion, constant nausea and sudden aversion to sushi and alcohol?