Hi Yaya
I am soooo sorry that you are having such a terrible time of things, I know how hard it is to think about anything other than the feeding, and you never get a "break" from the worry.
If you are correct, and your LO has a negative association regarding bottles, then I think you need to get some professional help. Somewhere in this forum there are some posts from mums who have had to seek help from a speech and language therapist to get their LO's to take milk from a bottle or other sources, following "bottle Phobia".
I think you need to re-discuss the issue with your Doctor again, and talk about the possibility of "bottle phobia"?!
I really hope you are able to get to the bottom of this soon, but make sure your concerns are listened to by the Dr's, as you are his mum, and know him best.
Good Luck
Gabriels mum