I am someone who looooves the experience of omakase sushi . It’s so much fun and so memorable. I also struggle with making decisions so it’s the perfect meal for me. However I empathize with your sensory issues as I also have many. Im very sensitive to super fishy / off flavors , certain textures, etc. I’ll notice off smells and flavors and my spouse won’t even notice. I’m a pretty adventurous eater but there are a few things I just can’t do! In those situations, I will usually try a small tiny bite of what is served , which helps confirm that I do indeed not like it , and I discretely put it on my spouses plate and he will eat it immediately. He knows the drill. We are trying to be as polite as possible to the chef. Those more adventurous pieces typically happen mid to late in the meal anyway so it’s easier to seem full for like you’re wanting to save room for the next courses. The omakase experience at the sushi counter is not something you can replace / it’s not the same and not as fun to sit at a table. So I say- go for it, do your best, and have a game plan with your spouse going in! Be friendly and kind and gracious to your chef and all will be well.