Carinheart, have you tried writing down what you feel and how your day is going in a journal of some kind? That really helps me to keep track of what's happening in my life, where my moods are and what triggers them. Sometimes, especially in the moment, it's very hard to decipher what is making you feel the way you feel or why your emotions are bouncing around, or if there is no cause at all. If you write it down when you feel it and what the circumstances are, though, you can go back over it later and maybe find a pattern.
If you really feel you need some help, I think you should get it! That statement alone is reason to talk to a professional. Do you need help finding someone who you can see on a regular basis?
My day was great until this evening, which was pretty bad. But that's all right, tomorrow has to be a little better.