Hi!
Here's an article you can refer to:
http://sg.theasianparent.com/when-baby-refuses-to-be-bottle-fed/
Since you have tried different teats and having another person feed him, no harm trying the other suggestions mentioned too.
One of my friends was in a similar situation and ended up feeding her baby using a dropper when she is no available. She then transit to a cup when her baby is older. So, no bottles for her baby at all. A tad more troublesome but at least she need not worry about feeding her baby when her girl refused the bottle.
Hope this help and happy anniversary (I do hope you got a night off to celebrate!!).
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