I am the same way with arfid, if it’s not routine then it really throws me off. The best thing I can offer, because I still struggle with this, is find multiple comfort foods that you know you can enjoy or at the very least nourish yourself. Mine are similar to the ones you listed but i’ve tried to find more like a beef quesadilla is easy for me, almost anything chicken. So just explore where you’re comfortable and find what is easy for you. Because we need food and not having enough is uncomfortable. I’m struggling with the OCD portion of my arfid but maybe try asking what would happen if you eat at a different time or a different food, I know it’s uncomfortable but it won’t be the end of the world and I think changing the thought process might help. You can message me if you want to talk or anything!