laranna - you'll find food/drinks will be in your breastmilk pretty much straight away, and will stay there for a few hours. What sort of foods had you eaten, do you remember?
Are you wrapping him to go to sleep? Emily loves being wrapped. When I put her to bed, I wrap her and it's like she knows that it's bedtime when I do that. Also, with Nina we had a thing called a 'sleep positioner'. It's a thing you put bub in between 2 sides when they're sleeping, and it creates a cosy environment for them. Maybe google it so you can see what I mean. We bought it from Big W, and she loved it. We used it with her until she started rolling in her cot.
Or the other thing I can think of, is if he's really unsettled, then wind maybe?