the worst day of my life so far..by far!!!

So heres the scenario...Zachary has just recently figured out he can get out of the crib..its on the lowest it can be keep in mind, and is in the stage where he crawls out of it and plays...well he also is still at that age where if he doesnt have an afternoon nap, he is VERY grumpy. He also likes to sleep with his bedroom door open so he can hear all the goings on of the house...our bathroom is opposite Zacharys room. Ok so fine...I put him down for a nap...I do some laundry...i poke my head in the doorway and he is sound asleep..so I take this opportunity to take the garbage out..i check again, he is still asleep. having to go to the sandbox (bathroom..) and have a shower, I decide to shut the door as not to wake him up...never had a problem..well I go to the bathroom, and something makes me go and check that he is ok..I was in there no more than 5 minutes, and Zacharys bed is empty....frantic I check the spare room (he likes to play in there), the play room...no Zachary...I run to the front of the house...no Zachary in the kitchen, Ians office, my scrapbooking room...no Zachary....I get to the front living room and notice in horror that my front door is open...I start panicking now...I scream his name...I run down my front steps into my backyard...no Zachary...I am hysterical by this point, and call my husband, running around our street barefoot yelling his name..hubby calls inlaws who head over right away...the 3 of us running around the neighborhood screaming ZACHARY...now he doesnt talk much, but he understands everything you tell him...I call 911...they ask me what he was wearing..do you think I could remember? I couldnt breathe, heart going a mile a minute..dispatch transfers me to RCMP, meanwhile Im still screaming his name...I get a cop on the phone, "yes my son is missing" ...by this point its been just over 30 minutes, and an extensive search thru the streets.....and who comes out of a backyard 6 houses down, covered in mud with a big smile on his face, ZACHARY....I ran to him...tears streaming down my face...Ian gets home, police show up, Cath shaking like a leaf, feeling like the worlds worst mother....I carry him back home...just so relieved he is ok... still today im shaky, and my voice is gone from screaming his name..and im getting a cold cos running around barefoot in -3 degree weather, with no jacket is not good for a body...we went to Canadian Tire and bought latch deadbolts for the 2 doors that go outside ..installed them...they will always be latched as long as we are inside... what a day....i have never been so scared in my whole life...and ive been thru a LOT!!! Life can throw a curve ball...in a blink of an eye...yikes!