Blocked tear duct surgery involving tubes, anyone had this done on their toddler???

Son is now almost 20 months, had probing surgery done at 15 months. Was hoping it was successful but seems to get clogged again pretty quickly after surgery. Now doctor wants to do silicone intubation (tubes in the tear ducts) for 6 months then removal. I am a nervous wreck and looking for ANYONE who has had same experience.