Well I have my ears stretched to a 6mm and yes it is possible to close it. 6mm is still a pretty fixable point especially if you've already closed you 4mm. Anything smaller than a 0 is fixable for the most part, but 0 itself is called "the point of no return" as it normally won't close up.
The best thing you can do is slowley go back through your smaller sizes closing it up carefully. Go to fast and you might get a very funny looking closed hole. Best of luck, and I hope it works out for you.
There is products to fix the stretch at Claire's but a stretched earring hole is not attractive so I think you should let it grow over then get it re pierced! Good luck!
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