I went through this about a year ago with my son, and while it was tough, we both managed to survive nicely.
We did a transition week. The first day I dropped him off and he was to only be there for an hour. I felt like the worst mother in the world, "how could I leave my precious baby", etc. and cried the whole way to the grocery store. I raced through my grocery shopped and rushed back to go get him and it hit me...
I peered through the window of the infant room and saw him, bouncing in the exersaucer with his teacher in front of him. She was engaging him in play and he was laughing and having a great time! And I knew...I knew he'd be okay, I knew he was in the hands of caregivers who have had years of experience with hundreds of babies. I knew he'd be exposed to so many more new and exciting experiences, more than I could ever imagine. I grew excited knowing that he'd be learning from so many wonderful and nurturing adults, and that completely put my mind at ease. I could return to the job I love and he would be in safe, competent, and loving hands.
It will probably be tough for you for the first week, but as you ease into this new routine both you and your son will adjust eventually. If you have to call the center ten times a day just to check up on him, do it! Just remember that mothers, fathers, company presidents, doctors, account managers, bankers, teachers, salespeople, pretty much all types of people had to grow up with some form of childcare and for the most part, they've all turned out just fine!