What Causes Tenderness In The Breast?

Just recently, my breasts have been very tender to the touch, and they feel more firm and bigger than before. I've noticed that I'm ALWAYS hungry and I can't go more than 5 hours after waking up before I want to sleep again. I've been trying to lose weight, but my sudden need to constantly eat has brought that to a screeching halt. I've been moody and emotionally sensitive...but I haven't missed ANY periods...none what so ever. My most recent period was about two almost three weeks ago. Please help.