Bottlefeeding?

I’ve had to start bottle feeding because my sons has a cows milk allergy, I only ever wanted to breastfeed so pretty upset about this. Anyway my son is only 7 weeks but he’s eaten about 8oz of formula in one go and he isn’t settling... he keeps trying to feed from me but I can’t do that as he will be sick, does anyone have any suggestions of what to do? He also normally sleeps having fell asleep on my breast but I can’t do that now, can someone suggest something on what I should do?