You are not alone Buffalo - also sometimes hormones make a number as LTD says - it is just part of the human condition. I am also trying to avoid antidepressants..
Some tips-
I scan myself often RE HALT rule -hungry,angry,lonely,tired- and do something about how I feel.
I also got a few books that inspire me, biographies about strong women. I also have identified my life has been lacking art. So I am looking for music I enjoy, looking for concerts to attend, getting out my paints to draw stuff myself.
Yoga is also a HUGE mood enhancer for me and is when I truly rest from the endless chattering and judgments from my mind. I hope you give it a try and perhaps take a class, or just get a beginner's yoga DVD.... it is truly worth it.
Hugs!