I am post bilateral blepharoplasty since 2015- woke up one day with right eye swollen upper lid. Ruled out eye infection, allergy etc had several docs examine eye-and ruled out thyroid as well. It's been 5 months now, no vision problems & OP surgeon ruled out any eye problems etc, does this happen? do I need to get a one eyelid blepharoplasty due to uneven eyes?