I am very sorry for you loss. I know exactly how you are feeling. I lost my 3 year old May 5, 2009. She would of turned 4 April 10. I had the same thoughts that you mentioned the days leading up to her birthday. I thought that I was going to totally lose it. I was able to get through it b/c I had lots of family & friends around. We all went to the cemetery together and just stayed together preetty much the whole day. I would suggest that you be around friends & family on your son's birthday. Even though I know it can be hard, sit around with your family & talk about memories you have of your son. Doing this for me was very helpful. Be strong. Do you have a website for your son? If you ever need to talk to someone who can relate to what you are going through, you can contact me via my daughters website at
http://makiah-thompson.last-memories.com/