would the act of using a great amount of energy be a source of attracting to these negs? as they seem to feed off energy.
yes
Also, wouldn't the act of raising an energy shield alone be enough to attract them to you?
yes
... then healers are probably one of the bigger targets of these negs am i right? since they probably have to use a lot more energy in their line of work?
no because the more you heal another the greater your energy body becomes so that if you open in protection and then raise energy in that order the more you work with energy the more you are protected . As your energy body develops and your vibration raises , then your natural protective shielding will increase too .