though this is purely my own observation/reality, no "truth" intended, but there are times when the awareness of the following helps me...

it's still not entirely clear to me how the mechanism works but i did notice that what in general we can call low vibration feelings is what they tend to provoke out of us.

so there is a tendency to feed on a certain vibration of emotions, like feelings of loss of personal power, overwhelming sadness, anger, abandonment, feelings of separation, the need to be justified by external forces (dependency), fear, etc. etc.

I am not sugesting every time we feel those it's interference but i'm developing a more subtle awareness about the mechanism of how these feelings exactly descend on me, and though i still miss the point sometimes, i can differentiate between my own organic feelings or those of an external source (though it depends on the particular situation rather than the type of emotion).

Maybe not so important, but i still add: what is not clear to me yet is whether these feelings are aroused on purpose - similarly to a poor animal who is made to get fearful and angry right before being slaughtered to make its flesh tastier (as they say, i've been a vegetarian almost all my life); or the low vibration feelings are a result of loss of energy (being sucked out); or is it the vibration of these particular feelings which is the fuel itself.

To tell the truth I can see there is a point where all these do not matter at all anymore. In the end it is perfectly okay not to focus on these issues too much, and there is a good reason too why in all spiritual teachings there is an emphasis on focusing on the type of emotionality that's nourishing rather than depleting the self (and, as Open says, focus on internal cleansing- both bodily and emotional...)