Oh boy, can I ever relate.....Understanding exactly how you feel, I do see that many hugs are in order for you. I hope our cyber hugs will help you today.
Sending many 's your way today. I know exactly how you feel. I agree, try doing something in honor of him because you know that he wouldn't want you feeling so down today.
On my dad's b'day or the anniversary of his passing, I usually try to do something that we used to do together or have a meal he would have liked. This past one, I went to Borders and perused the books a while. I got the passion for reading from Dad, and figured that would be a good way to honor his memory.