I suppose it is possible that it opened up. Just ask your doctor to re-examine you with another probing that would be the only way to truly answer the question. By the way, if all your symptoms are gone, it may be a moot point.
I truly hope that your symptoms are gone forever. I'm a non-professional, but your description doesn't make anatomical sense to me. Swelling of the lacrimal sac suggests blockage in the lower (nasal) end of the tear duct, rather than in the upper end in your eyelids. Perhaps anything is possible. I know that there are minimally invasive procedures such as dilation with a balloon catheter which can unblock tear ducts in some cases.