okay since Breath No More wasn't written for Electra i'll not relate it to ...especially since i haven't seen it yet ...it. I think it is about a relationship were the person is famous or successful and the other person that isn't famous or successful wants the famous person to be that way all the time. the famous person or whatever tries to be themself and is rejected so goes back into the lie of the only one way everyone wants them to be. They have been this person for so long it is killing the real them inside and they don't know if that person can ever be brought back...... but it matters to noone anyway.so the "convince me that i've been sick forever" part is when the true person tries to come out and they reject it and so they go back..."all of this will make since when i get better" ....everyone loves them again and "everyone" is happy again and life appears peachy. so metaphorically that person is dead and they "breath no more".