3rd trimester blues

Seems like as soon as I hit my 3rd trimester I'm moody, depressed and just totally physically uncomfortable. Granted I would not trade these symptoms for my 1st trimester symptoms. 1st trimester was pure hell. But my 2nd trimester was so good! I felt great, my mood was good. Now I just feel so "blah" all the time. I'm sure it's not all hormones as my father was diagnosed with cancer about a month ago and my grandmother died last week. But I just can't seem to pull myself out if this. Any advice?