Here is a list of symptoms of low progesterone http://www.hormone-healthy.com/Symptoms_of_low_Progesterone.htm. It's really quite a list. If you decide to use progesterone cream consult with your physician before you do. If you decide to get progesterone cream the best one I know is this http://www.amazon.com/Progesterone-Herbs-Bioidentical-Paraben-Free
Creme/dp/B0016G7VY0/ref=sr_1_5?ie=UTF8&qid=1316901937&sr=8-5. If you want to know more about this take a look at this site www.johnleemd.com.
I purchased this product myself and I'm starting to use it soon. Mood Swings are related to hormones and in your situation it's possible that you do need progesterone cream. For such matter if you like send me private message here and I'll give you more info. I have learned so many things that are hormonal issues and my doctor has explained to many things in how much for a women all their problem is hormonal. I couldn't believe the kinds of these he said to me which are very true.
Keep me posted, I'm glad to help.