My mother is the one who told me to try flaxseed when I was getting kind of moody and low energy.  It turns out that flaxseed, if you grind it yourself, can turn around an emotional rollercoaster and balance out those PMS hormones like nobody's business!  I had a friend of mine tell me, " Oh I tried flaxseed, it didn't do much for me."  I asked, "Did you grind it yourself?"  
She said, " No, I bought it preground."

Let me explain something to you.... the abundance of omega-3 fatty acids found in flaxseed are mostly in the oil of the seed.  Which are then released when you grind it (you need to grind it by the way) but will evaporate after being exposed to air for more than a couple days.  So buy yourself an $8 grinder and grind 2 tbsp of it every morning. Put it in your V8 juice, your oatmeal, your yogurt or even your cereal.  It's got a nice light nutty taste and YOU WILL NOTICE A DIFFERENCE.  When I really need some help, for example right now when the seasons are changing, I take 2 tbsp in the morning and 2 more around 3 pm (in a snack like yogurt).  Man, I'm making myself hungry...