Second trimester exhaustion?

Marni. • 👧🏻 June 2011 🤰🏻July 2019! 🥰

Have been feeling really great when suddenly... I drag myself through the morning only to sleep all afternoon and I even feel a bit nauseous again! What’s happening? 😢 I want that 2nd trimester glow and energy surge!!! I’m 18+2.