Why can pregnancy be such a pain?!? I'm SO sick of feeling blah, dizzy, light headed & tired. DOes it go away?

I'll be 17 weeks on Saturday, I don't remember feeling like this when pregnant with my son and I know every pregnancy is different, but geez. Lol. Last night was awful I felt like the flu almost hit me, but had no temp or anything. Just felt icky upset stomach, nauseated, little dizzy, weak. I went to bed around 7:30ish another thing that's bothering me is feeling my heart/pulse all the time and I think it brings on my anxiety which I have had growing up and runs in the family big time. So i'm thinking those symptoms I listed up above is part of the anxiety. Its just annoying and hope there is something I can do about it.