First, let me tell you that you have come to the right place for support. No matter what your situation is, someone here on the board can identify with you. Grief is probably the strongest emotion, second only to love, so it affects every fiber of our being. Your emotional upheaval could be responsible for the differences in your body's physical changes, but I think you would be well served to see your primary care physician for a blood test to completely rule out a pregnancy. There's currently a popular TV series called "I Didn't Know I Was Pregnant" on the TLC/Discovery Network, which has stories every week about women having children with little or contraditory symptoms. Since you were trying to get pregnant, the possibility does exist, and I think you really need to see a medical professional to definitely find out one way or the other. If you aren't pregnant, it could be that you need some type of hormone therapy to even out your system. Either way, it's something you can do to remove a little of the "limbo" state you are experiencing.
Grief alone is enough to deal with, so any auxiliary issues you can resolve will only give you more time to focus on putting the pieces of your life back together and moving on to whatever the next phase of your life will be. I wish you all the best and please let us know how you are doing.