First tri having a ruff go.

I'm only 7 weeks and it's been really hard. I'm so tired and nauseous. Last night I got sick and then felt a bit better so I could fall asleep        I'm not sure why but I feel worse in the evenings. Maybe cuz im trying so hard to act normal while at work to hide it. My body gives up once I get home? 
Just wondering if anyone else found it hard keeping it a secret at work. I don't feel like I can trust my coworkers not to tell others. I don't want to tell them till after 3 months. It's really hard when you feel like there's so much going on with your body and your all alone dealing. 
My hubby has been really supportive. But I feel guilty I haven't had any energy to even want to think of sex. I hope my drive comes back. I think I'm broken. That's today's Prego rant.