Feel terrible

I am having a really tough time. Ever since I found out I was pregnant a week ago I have felt like I have a hangover almost all the time (and no I am not drinking alcohol). The nausea and heartburn are unbearable. And I am so tired I can barely function. I am going crazy. All I want to do is go back to bed. 
Ladies I would love some tips and to know that someone out there understands. 
It's killing me that I can't act as happy as I am inside.