I can't sleep! I'm losing my mind

I'm 13+2 today and haven't slept more than 15 minutes or so at a time for almost 2 weeks. I am going crazy! I take unisom with b6 to help with nausea and I get sleepy but not enough to stay asleep! I'm terrified I'm literally never going to sleep again lol and I've been so so so sick and dizzy my ob has me on bed rest for safety because I'm so dizzy (I've had terrible vertigo since a medical scare a couple years ago prepregnancy and it's gotten worse and come close to falls so if I'm feeling well I can do small things but if I get too dizzy or sick she wants me in bed until it improves) I'm basically useless that I'm just an exhausted and emotional, grumpy mess!