Birthday Mommy Guilt!

Can you ever really shake away the Mommy Guilt?  Today is my youngest son's birthday.  He is 4 years old.  After work yesterday I brought my oldest son to his drama class and then planned on rushing to buy a cake for the daycare before I had to pick him up.  Didn't think it would be so hard except that every cake I could come across in that hour had that little warning at the bottom of the ingredients list: May have come into contact with tree nuts!  Of course his daycare is peanut-free so I can't get any of those cakes.  As the clock was ticking I was getting more and more panicked that I wouldn't find his cake.  That's when the mommy guilt started to set in.  I could hear the little voice inside my head say: "I should have baked him a cake myself" (don't know when but I should have), "I should have spent the extra money and ordered a cake from a fancy bakery where I could make sure it was peanut free" (not really in my budget, but again, I should have).  Finally the hour was up when I had to go pick up my son from Drama class and I was cake-less- "Worst Mother of the Year".
Thankfully, my father agreed to help me and he is running around right now trying to get a cake for him to bring to the daycare.  I know it will be ok but I can't shake this Mommy Guilt!
That's one of the things that's hard about being a single, working parent.  You want to be able to get everything done but the fact is, there just aren't enough hours in the day!  I can get through the day-to-day pretty well but special events just throw me for a loop.  Thank goodness that I have the support from my father and brother to help me out because I don't know how I would be able to get things done otherwise.  I want to be able to give my kids everything they would get if they were part of a two parent home but sometimes I just can't.  I don't like to complain about it.  It's not really my style and I don't want anybody feeling sorry for me.  I love my life it's just hard sometimes.