I have my works Xmas party tonight / meal followed by drinks. I’ve been up since 3am with the baby and I’m so tired. I’ve a full day of work and really cba. I can’t tell anyone my hidden life of exhausted mum / as I can’t bare the discrimination so I turn up polished and enthusiastic every day. I want to leave after dinner but how do I do this without looking like a snub and not explaining my exhaustion?