Day 3 dies away

Day 3 is nearing its demise and I have to say that I am more than a little perplexed as to how I am feeling. I have been jogging/running and, although it's not far or fast, it's good. I have been to an exercise class, an achievement in itself, me not being a typical exercise class going kind of girl, if you know what I mean. So, with this in mind I feel like I am happy, positive and succeeding. However, why does life always have an however? However, on the other hand I feel poorly, stressed, grumpy, and am a completely cantankerous female who feels as though she is seeing the world with new eyes. This new world is unreasonably demanding, domineering, just plain unreasonable. Or, God forbid, is it me ?