What Causes Soreness In The Joints?

I am a 42 y/o female, 5'5", 160#. I have no medical conditions/issues. For about 2 months I have been sore all over. My back especially. My bones feel like glass. I cry everyday, sometimes over things I start thinking about, sometimes for no reason and sometimes over things that don't bother other people. I am active, a teacher, mother of 1 and stepmother of 3. In the last year, I have lost my nephew to murder, 2 very close friends to cancer. Am I just depressed? I am so tired of being angry, sore, tired and sad.