I’m just the Ba’al Tschuvah in the room, but I have been given bad advice by rabbis before including orthodox rabbis and I must say that I have solved most of my own problems by myself with Jewish principles. That said, I am not really familiar with the need for a woman to shave her head and perhaps someone can inform me of the minhag. I do of course know that if you took a woman in battle, that you are required to shave her head. Being that you are clearly Jewish from birth I think, I can not completely understand how this might apply in any sense to you.
But that said, if you are looking to rid yourself of some evil in your life, I think that the best way to do this is to give to charities. Its better to give less to more than to give more to less charities. I have done this many times and am very pleased with how I personally feel. But I do not think that you are obligated to comply with every suggesting from a Rabbi, no matter his esteem. That is my personal opinion, though many here will obviously condemn me for disregard to a scholar and someone who they will say is clearly a tzaddik. (maybe or probably, but not my consideration).
I would imagine that cutting your hair completely off would have one benefit in that it would be easier to cover your hair in public which I am guessing you completely do.
But that said, I can not feel in my lifetime that I am going to obey a rabbi unless I completely feel that it is HASHEMs direction I feel was offered to me. If this is the case, do it and do everything you hear you must do by your rabbinic source. But that said, I must confess to you that many things that I hear from many of the rabbonim today do not in my senses feel that they are mandated or even considered at all by our Creator.