I have a disability that makes the shahada very difficult for me to pronounce

Salam alaykum, I recently decided to convert to Islam. The problem is that I'm in a very complicated situation because I think I have serious neurological problems. I don't know why, but when I want to say something I feel very strongly about (in this case, the shahada), my brain triggers some kind of mechanism that makes it very difficult. It goes beyond a simple stammer, I'm literally blocked and it can even take a full five minutes (no exaggeration, I'm talking about five real minutes) to manage to pronounce it. I can't hide how complicated it is, it takes up so much of my time and energy. I know it's normally obligatory to pronounce the shahada verbally, but not wanting to experience this very complicated moment, I pronounced the shahada in my head. I thought that with my disability, my conversion would be accepted. Can you please answer these three questions: 1. Was I right to think that way? 2. Is my conversion accepted? 3. As regards oral recitations of acts such as prayer or repentance, can I perform them in my head because of my disability? May Allah reward you for your efforts