Roller Coaster

I had a great day yesterday. The girls and I were productive and happy. We went grocery shopping in the rain, prepared a meal and got Family Home Evening ready without any complications. We played and giggled. I got to have about a 15 minute nap that was just enough to keep me going and motivated on my goals, but too long to make me groggy. Cailyn was a great helper and Jessica was happy and smiley.
Then today hit us. There was a loud thunder storm early this morning, so the girls ended up in my bed. Jessica wouldn't sleep more than 20 minutes at a time all day long. Cailyn was hyper and loud all day. She couldn't slow down enough to listen to me, much less do what I had asked her. I had an extra baby today who would start to cry before his bum even touched the ground(NO EXAGGERATION!). He did take a nap in my arms for about 10 minutes, but as soon as I bent down to lay him in the crib he woke up and refused to go back to sleep. This prevented Cailyn from receiving a nap(and me--which I so wanted), so she was a very tired, hyper 3-year old(if that makes sense). Jason had previously told me that he was staying late at work to do homework, so I was anticipating that one. But that doesn't really make it easier, just expected. Needless to say, I never got a shower today. I don't know why, but that just makes me feel like a lazy person. Not that I am, because I certainly did plenty today, but I never got myself ready. I am literally still in my pajamas. It really bothers me when that happens, because it just keeps me down all day.
So I guess my point is I am confused that I can go from the happiest person on this Earth one day, to totally depressed the next. How is that possible. It usually takes a while for me to be this down after a day like yesterday. My emotions(probably hormones) are totally random and strong. There really isn't any middle ground. I feel either complete joy or utter despair or raging anger. Not much gray. Is there something wrong with me, or are my hormones just trying to level out after having Jessica and nursing her for 10 months? I am not really wanting an answer, just thinking out loud.
Sorry for the downer post, but I need to unload and I don't want to burden Jason any more than necessary. He is currently off with Cailyn to get a pizza(we never do that, but I requested it and he obliged) and Jessica is already in bed. So, I am using this spare time to release my frustration from the day.
On a positive note--Jessica's record right now for the most steps taken without holding on to anything is 5 steps. She is constantly trying to walk to things now. It is very exciting!
Again, sorry for the sour mood.