nekoman,
Hi,
The more you agonize over "what if" the more of your own energy is expended in what is really just neurotic thinking. It is only in a fairly rare case, I would say, that someone actully leeches energy from us. And, such action usually requires some intention. So the question would be: Why would anyone want to leech your energy? Just because you feel "de-energized" does not mean someone is doing something to you (except perhaps yourself)
Cheers,
RC