I did it much the same as Beema - only my stupid doctor at the time would not give me motillium (because its for nausea, not breast milk, grrrrrrr) and so my supply just went down with the less time. But always breast first and a 1 scoop top up afterwards. If they guts the 1 scoop then I would make them another one. I never overdid the formula comp but sadly never got decent supply.

When they are just fully fussy and you are missing the queues, especially if they have been fed not so long ago - try everything else before food. Check the nappy, check for wind, try some tummy to tummy time letting bub look up at your face, a bit of carrying around. I even got the pram in the house and sometimes I will put her in there and just roll it back and forth - usually she just drifts off to sleep with that. If he is still screaming despite all that, try feeding again. Usually with formula they don't scream again soon after unless a burble is stuck or something else is bugging them.