I'm pretty much in agreement with the responses that were offered in the other thread. Based on my own experience, it appears that you're undergoing a period of uncertainty regarding your identity, attempting to understand and define the boundaries of who and what you are. The only thing you're possessed by is the misinformation some have been feeding you. That feeling in your stomach is your minds way of telling you it's been poisoned, that you need to throw that trash in the garbage and leave it alone until such time as you are able to distinguish it from reality.
Reason illuminates the path of understanding that leads us out of the shadowland of confusion and uncertainty. It is the only antidote for a poisoned mind and the only means to regain full possession of your faculties.