OMG. I did this when ex-h was in the trauma center. I was so sleep deprived I got off on the wrong floor and had a complete melt down outside some poor person's room because he wasn't in there and I was convinced he died.
Hang in there, momma. Make sure you are sleeping and eating. Hunger and sleep deprivation totally deplete common sense and rationality.
You are such a good mom suesue. I can only imagine how upset you were. He is in the safest place he could be right now. Try to relax and keep some emergency chocolate in his hospital bag. :-)