He might be teething... babies do this when they are teething many times. But it passes. Just make sure he gets enough intake... so he doesn't get dehydrated and gets enough nutrients.
Or, try a sippy cup with him.
Or, could he perhaps have oral Thrush? Look in his mouth and see if he has white patches... this would indicate thrush.
If so, take him to the Doctor.
Is he still nursing from you, fine? Is it just the bottles he rejects? Hmmmm.... maybe use a different flow nipple? I used MAM bottles too, my son loved it and me too.
Maybe he is just sensing your going on another trip?
All the best,