I don't think you have puffiness or fluid retention.
You have lower eyebrow droop.
It could last as long as the effects of the botox. I had eye surgery and afterward one eye looked larger than the other. My doctor said it was because I unknowingly arched the brow on my right eye to compensate for my left eye. He injected botox into the right upper eyebrow only. His intention was to bring the muscle down in hopes that it would stay in place once the botox wore off. I developed a droopy lower eyebrow. It has been 9 weeks. It still droops, but not as badly. I figure it will be gone when I can move the right side of my forehead again.
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