Well first of all, Congratulations!
It sounds like you are still in your 1st tri. By your 2nd tri you will feel so much better...you will have tons of energy, the nausea will have subsided and you will feel the best you have ever felt. That's when I loved being pregnant. I also enjoyed my 3rd but love the 2nd. As for the emotional roller coasters...well that's here to stay for a while...maybe even after the baby is born. I really didn't do a whole lot of crying when I was pregnant but notice I was after I had the baby and I have had friends that have cried throughout their pregnancies and after.
I hope it gets better for you soon! Hang in there:)