Assuming your personal narrative isn't fictional or embroidered for evangelical purposes, I wonder if you're aware of why, as you say, some people "get mad" when they hear this "testimony."
Perhaps it has to do with the concealed and twisted arrogance at the bottom of it. After all, you pretend to be humble when you say "If God did that for me, He will do it for you." You were only a lowly drug user, after all.
But your testimony actually implies that you deserved God's special attention, since hundreds of millions of other people around the world aren't saved: they suffer and die under dire circumstances, perhaps praying for a miracle only to receive none.
The listener of this kind of evangelical testimony inevitably puts it in the context of the problem of evil, since we're all aware of the many times we didn't get what we wanted in life. Then you come along and declare that God personally helped you out with a miraculous transformation.
My point is that this kind of testimony is meant to establish your authority as a Christian leader, but you do so in that typically Christian, passive-aggressive manner that's so off-putting.
Does that help clarify the negative reaction you seem to anticipate?