Need to vent and need advice

Lately, my partner and I have been going through a lot in regards to finances and with his family. Lately tensions have been high. I've also been recently been diagnosed with adhd as an adult. It makes sense to why I am the way I am. And it used to cause a lot of our arguments because I wouldn't finish a task or get really sensitive or my understanding of things weren't the best. He'd get really annoyed with me. So I've been managing it with therapy and medication. But these past few days. My partner has been in a bad mood and knit picking at everything I do. Even last night there was a freeze warning and I turned the heater up for our kids. And he got so mad at me because he was hot. Then a few more things bugged him and he raised his voice and I just let it be and said to myself. He's tired. Then in the morning. I start cleaning the kitchen because he offeted to make breakfast. I left one sippy cup out because that section was unorganized and didn't fit so I wanted to finish washing the dishes before I got to that. Here he comes and says. Is this cup clean. I said yes. he then asks why I left it out. I explained why. He then proceeds to ask why I didn't finish the task and I'm doing it again and he's told me before to finish a task before I start a new one and because of my condition I'm doing this and I shouldn't be because I'm on meds and therapy. I said I'm going to get to it as soon as I'm done. It's one cup. Then he says I'm inconveniencing him because we're not working together and he needs to cook and this gets in his way. He organizes the cups and he doesn't even use that side to get ingredients or cook ( the stove and fridge isn't even on that side). I was.going to organize them but i was trying dry my hands and he beat me to it. I then ask him if he really needed to get on me about this. And he said yes because he's Told me before. I said I've been trying my best not to do that. And I said he's not my dad. He said might as well be. You need it. ( he knows my biological dad wasn't in the picture and my stepdad wasn't the best). So I'm starting to get mad and we go back and forth and I say I can understand what you're saying. But can we find a different approach for both of us. He says no. If you don't finish a task. Im going to argue with you. So he's basically saying I need to fix myself and not him. I start to cry and it's been a while since he's made me cry. I used to cry all the time when he'd do stuff like this. Then he starts raising his voice because I got stern and says we can yell if you want to yell. I wasn't yelling. Yes I got triggered and got defensive at first and then saw his side and tried to find a solution. Idk how to handle this. I feel defeated because he's been snappy this whole week. Some stuff I get. But some stuff I didn't even realize. I'm sorry I'm just venting.