I've had PAD come and go ever since I saw it. If I start to really think about Avatar, I start to feel sad and depressed. Definitely not as bad as when I saw Avatar the second time, (second viewing was when PAD hit home and I truly understood the movie).
But yes, PAD will come and go and the feeling usually decreases over time and become less prominent.
However, I personally LOVE the feeling Avatar gives me, it is such a unique and magical feeling and I never want to stop feeling that.
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