This sounds tough, FS. I echo what May says about there being a difference between looking out for your own interests, being fair to yourself, and in being irrational. Your H might get angry and might see you standing up for needs and wants that he doesn't share or doesn't understand as irrational, but then if you both saw eye to eye on all of this - particularly the matter of each other's needs - well, you might be in a different place. I hope you can do this in a way that is calm and respectful and as amicable as possible, but I am not sure rolling over and not speaking up for the truth of what you want and need is a healthy way to go about that.
I had a big clear out when H moved out too. He keeps cardboard boxes and old broken computer equipment and even milk crates and the polystyrene casings that come inside kitchen appliance boxes. One dark day a few weeks after he'd moved out I went into the cellar in a whirling rage and took the entire lot out to the car and to the tip. I hurt my back too. But it was cathartic and even now he's back, he hasn't mentioned it...
