DG In order to express colostrum, you want to do it as often as possible. IE every 3 hrs and give it a 30 minute go each time. You will really need someone to do everything else for you except maybe give you a bath at this time.
Please please do skin to skin contact tomorrow, in bed, even if he is 'only sleeping' on you, all day if you have the help. Nappy on him, maybe nursing bra only on your top. your presence will rouse him.
Following formula after a few sucks at the breast means that he is filling up with formula. Is he actually drinking at least some of the formula? If he is, no wonder he wants to sleep. Is he weeing and pooing? That is the best gauge of whether stuff (bm or ff) is going in.
Have you rung a helpline? If your midwife is so concerned, she should be not be recommending you to revisit hospital. I am sorry but I still cannot trust her judgement. Either he is well enough to be home, without lights and formula, or he should at least have his bilirubin levels tested and / or taken to hospital for monitoring.
Another problem with what is happening, if he is getting formula and that is satisfying him at the moment is that he is not stimulating your breast often. Breast stimulation will help your milk to come in. Alfredo is not getting a fair chance in doing that.
Ask the helpline for when and where is the nearest breastfeeding group you can go to. she will probably know one in your area with an accredited counsellor.
I really appreciate that you are scared because of his jaundice and I hate to contradict someone who is in a position of authority. Especially one who I have never met but nothing from what she has told you is going to actually help you breastfeed. I had a 'mare of a time with the same issues and dd and I left hospital after 8 days but the 'care' we actually had was appalling, I now know in hindsight. I have done a lot more research into jaundice because of this experience as a way of getting over the psychological trauma of her and my post natal experience.
Link to show you stomach sizes.