Feel like I’m unable to do my job.

I’m 7 weeks 5 days pregnant. I have severe nausea and vomiting. Its made me so dehydrated and I’ve already lost a few pounds. I work at a nursing home and I have to drive 30 min everyday. I’m almost always falling asleep while I drive, I’m throwing up at work and I’m not able to give my residents the full attention they need. And we don’t have enough staff that I’m able to have extra help all the time. I just don’t know what to do at this point. I’m miserable. Today is my first day back at work after being super sick for 3 days. And now the medication I’m on for the nausea makes me feel sedated and I feel like I can’t stay awake. What should I do at this point ☹️