Hi and welcome!
I do not have the plug, but I did have my tear ducts cauterized, which pretty much serves the same purpose. My opthamologist didn't want to use the plugs because my cornea was so chewed up, he didn't want to run the risk of the plug falling out, which happens sometimes. I know my procedure helped more than I ever imagined. I was in so much pain before I had it done that I was putting drops and gel in every 15 minutes and it still hurt like crazy. Now i don't use drops at all during the day and use the gel at night.
I know of some people (my facial PT, actually) who had the plugs because she has chronic dry eye. She said they helped her out a lot. One of hers fell out too, and they had to put a larger one in. I guess sometimes they have to play around with the sizes before they get it right, but everyone I've talked to is happy they did it.
Not sure if this helps or not!
Lori