What has caused sagging cheeks and sunken eyes in the space of a few weeks? What can be done? (photos)

I have just turned 30, and in the space of a couple of weeks, my entire facial structure has changed. I cannot pinpoint what the change is or what has caused it. I had a stomach bug and wisdom tooth infection within the space of 3 weeks of each other in May 2016 and following that, under my right eye became hollow, the cheek seems to have dropped, and my whole face seems to have lost fat. My face just doesn't 'come together' anymore. Can anyone please advise? Thank you.

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