Need to wean my 18 month old...

I don't know if anyone has any advice but I'm strugglinggggg! My son is 18 months old and I've managed (much to his dismay) to cut down to feeding just twice a day and each day is just from one boob 😅 (for a week now I've stuck a plaster over one nipple and told him mamas hurting) he isn't happy with this and still asks a couple times a day and may cry or run away but it's manageable usually with the offer of a small snack, drink or toy. I get married June 29th and after will be going away for a week and my son is staying with my parents so I need to wean him but given that he is already struggling (I've been cutting down since November so it's been a long process not a sudden one!) I don't know how to break down that final leap without just leaving and then possibly being uncomfortable on my honeymoon only to return and have him lose his mind that I'm all dried up. I've tried distraction with books and play or snacks like I do other times he asks but when it comes to that first feed of the morning or the one after dinner he goes absolutely crazy if I say no or even just wait a minute. If it's not instantly the first thing I do when we get downstairs or he finishes dinner he's throwing himself on the floor,smacking his head, screaming and sobbing it's so heartbreaking. Occasionally in the mornings he's been distracted if someone else is there but after a couple hours it's like he remembers he missed it and will randomly kick off. I just don't know what to do it's making me feel so guilty about going away.