vez - again probably not what you want to hear but young babies need their mothers and while he will recover from being parted from you for 2 days, and be well-cared for I imagine when you're not there, it's just not realistic to imagine he won't notice it.
This is not much to do with breastfeeding, because of course with juggling and expressing and putting up with discomfort you'll maintain a supply, but everything to do with your baby's needs not just for calories to stay alive and growing (obviously that will be sorted either by ebm or formula or a mix), but for familiarity, consistency and closeness with you. If you think you will miss him - with your understanding that your break is short - why would he not miss you, but without any understanding that he will see you again in 2 days?
Sure, he'll get over it. And you'll get over it. And things will be fine in the end. But I honestly think you need to accept that it may not be that wonderful a break for you, for all sorts of reasons, including the awareness that you are leaving a little person who loves you and whose life is bewildering because you are not there.
Is taking him along with you not the most comfortable solution in every way?
I am really sorry to sound bossy about this.
But you did ask for input :)