Well, personally, I don't want to minimize how you felt or how you feel. If you took that as your sign to stay inside the organization, then that is your choice and your feeling. I think it would be hard to do anything that goes against one's own gut feeling.
A long time ago, long before I left Jehovah's Witnesses, I took time to study another religion, and I had enough doubts about the Witnesses at that time that I thought about leaving then. In time, as I studied Watchtower literature further, I reinforced my resolve to stay a Witness at that time--and the preaching issue was at the core of that choice. There was a line of reasoning in the 'Live Forever' book that said, if someone knocks on your door, uses the name Jehovah and speaks to you about the Kingdom, who do you usually conclude they are? I thought that was pretty convincing at the time. It seems you have beaten back your doubts with a similar line of thought.
The first thing I would say is, the preaching work is itself not at issue in terms of deciding to leave or to stay. Why would I say that? Because the problem is NOT the preaching work in itself. That was NEVER the problem. The problem is, this preaching work is so thoroughly regulated by organizational procedure that it loses its meaning. It's turned into a compulsory work measured in hours and placements rather than in people and acts of kindness towards one's neighbor that go beyond merely leaving literature with them. To be sure, people can be helped and good can come of it, but the ultimate objective is always recruitment, not unconditional love. On top of that, you are required to preach a message that includes things that simply are not true and cannot be proven by scripture. As I said once before, if you preach a message that is not true, you bear a responsibility for the lives of those who believe it.
So to counter what that ministerial servant said to you, if you cannot preach something that is true, then and only then should you never preach again.
The question is, do you have the option of remaining in the organization without preaching and agreeing--both privately in your own thoughts and publicly--that every word written in [current] Watchtower literature is the absolute truth from God? If you remain in the organization for the sake of how they have organized a preaching work, then the answer will be no for you.
But you can preach something that is true, if you still believe in the Bible's message. The original good news was and is always about one person--the Lord Jesus Christ--and what he did for mankind. If you can open your Bible and show that message to your neighbors, then there is no reason at all for you to stop preaching. The organization isn't the absolute end-all, be-all for preaching.
Witnesses will always find something to guilt you over if you think about leaving or 'slowing down', and the preaching work is often a suitable stick in that regard. It's a form of manipulation, in the end, and designed to keep you busy enough that you don't actually think too hard about what is being taught. Emotional and behavioral control.
I hope you find your way ahead in time. Tread carefully with all this, and for the love of Anthony Morris the Third, don't date anyone.
--sd-7