Is it wrong to seek treatment without my partner knowing?

hi, I'm new here. I was diagnosed with ADD long ago, was put on meds and when my mom didn't like the effects, I was taken off. My grades suffered and I never did graduate. I was 2 credits short. I never did blame ADD. I took on the idea that ADD wasn't even a thing. I was just a slacker. Well fast forward to recently. I saw an article about ADD and while scoffing, decided to read it anyways. I was astounded by how many boxes I ticked. I probably wouldn't give it a second thought if my relationship wasn't suffering.

my partner chooses not to believe ADD exists, and refuses to aknowledge it. I don't even call it a problem, it's only a problem if you choose not to do anything about it. im considering seeing someone about it in private, but I don't like secrets.

I know I can't rely on his support but I feel like if he were to find any evidence of it that he would leave me and our daughter.

i can't go on without treatment. My life is chaotic and I struggle to finish things and get organized. It's killing our relationship. We had a huge fight today because he came home and the house was a mess, like a huge mess, because I was trying to do 5 things at once and he was about 5 hours early. I explained this over and over that it was going to be perfect once it was finished and that I didn't have a chance to finish.