My first pregnancy I'm going nuts?

I'm 6 weeks pregnant my breast were sore and swollen up until this morning. Now they're not sore or swollen anymore but my mood is going nuts! I woke up this morning not hungry then I told my fiance "IM HUNGRY" only to eat one slice of pizza and lay down. So far today I have felt peaceful, calm, happy, depressed, anxious and nervous.

I'm usually pretty organized with my health. I like to wake up early, eat breakfast, stretch and plan the day. But that's all out the window recently. Can anyone relate?