Well, it isn't an attack, so no worries on that count. The swelling feeling is a center - most like your heart center given the location of the feeling - expanding as you project. There are about a million reasons this could be happening, but most people experience a sense of expansion in one or more of their major centers when they first begin projecting. You may have recurrences of that feeling during the course of a normal day after a while.
It's perfectly natural, just push through it and allow yourself to accept the changes your energetic bodies are undergoing in order to allow you the experience of astral projection.
Good luck!
peace
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The world is complicated - that which makes it up is elegantly simplistic, but infinitely versatile.
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