Being DF'd and the hoops I had to jump through to be reinstated is one of the things that always stuck in the back of my mind and probably led to many more doubts. There were brothers who were not elders (I think they were MS's) who were so much more compassionate to me than the elders were. When I was helping my parents with their house and these brothers were there helping as well, they actually treated me like a person and took the opportunity to express encouragement for my continuing to come to meetings. In contrast, the elders who df'd me (I moved back in with my parents and to my home congregation after being df'd) wouldn't even consider first request as they felt that my returning home was like running away and not facing up to my punishment. I was reinstated on the 2nd attempt, although I think the BOE at my home congregation did some strong lobbying.
I once heard someone say that a person who is df'd never returns to the spirituality they had before. I now understand that. I could not return to my prior level of spirituality because I couldn't reconcile how this arrangement was loving and ok. Prior to being df'd, I viewed disfellowshipping as most JWs do- a loving arrangement, a protection for the congregation and a way to shock the sinner to repentance. After experiencing it for myself, it was so harsh and cruel that it stuck with me that disfellowshipping is not a loving arrangement. I vowed that if I was ever an elder and part of a JC I would never agree to df someone.
I still couldn't question my beliefs because of my emotional attachment to family and friends, but had this not happened I may have never woke up.