My finance doesnt help with wedding planning despite my numerous pleads for help

My (29F) fiancé (30M) hardly helps with wedding planning and I’m so over it. I’ve made a Google Sheet for us, so we can both have the latest version at all times. It includes our guest list, details that we’ve cemented, our itemized budget, a to do list, and our vendors’ contact information. For context, my fiancé has ADD, so I understand that it’s not as easy for him to sit down and do wedding tasks. However, I’ve communicated that I will not be planning this wedding on my own and he actually has a lot of great ideas/opinions. I’m frustrated because I will be proactive and check things off the list as I have time. But I actually had to write out a checklist for my fiancé (this is in addition to our digital list) to encourage him to get certain things done that I physically can’t do, like go get fitted for his suit, or ask his groomsmen to be a part of the wedding. Tonight I asked if we could work on wedding planning stuff tomorrow and he asked what time. I said it depended on where he was at in his checklist and I started asking him what he had gotten done. He blew up, got super pissed off, and it turned into a fight because he said he felt like I was berating him for all the things he hasn’t done, right after getting home from work. He works in the medical field so he has long, shitty days. I truly did not mean to even get into wedding planning conversation, I just wanted to know if we could do some of it tomorrow. All I expected was a simple “yes” or “I can’t, I have plans tomorrow”. But he made me feel like I was hounding him for answers on what he’s done. The real kicker is that he hasn’t done much of anything on the list that I wrote for him about 2 weeks ago. I feel like I have to constantly follow up with him, or else nothing gets done. I’m at a loss of how to ask for help with planning from him. I refuse to plan this on my own AND pay for the majority of it. We agreed to that, because of the differences in our salaries, but now I feel like if I’m going to be the whole wedding planner too, he should pay for more of the wedding. Also, for context, we both work full time. I have a 7:30-4 Monday through Friday and he does three 12 hour shifts during the week. So it’s not like one of us has more time than the other. What do I do to get through this? We still have 5 more months until the wedding and a lot to do.