I'm sorry you didn't get the job
Unless you're unwilling to work for someone who doesn't truly embrace their equal opportunities policies, this seems counterproductive. Does it really matter if their biases/misconceptions creep into their hiring policies -- given how much you want to work?
Also consider that if you get a job somewhere and declare your disability later, after you've proven yourself, you may be in a position to change your employer's preconceptions about people with disabilities. They might need to have that positive experience of having hired someone with disabilities who turned out to be a great employee if their biases/misconceptions are ever going to change.
Assuming you are being turned down solely because of declaring your disabilities, if you continue to declare them nothing will change for you or anyone else (at least not with those employers that have bias against the disabled); It's not doing anyone any good unless you're unwilling to work for anyone who has any bias against people with disabilities (in which case maybe it does you good, since you're following what's important to you/doing what you need to do).
This could very well be just an excuse.....but in your place I would consider the possibility that your answers played some role in their decision, however small. If you can remember any of the questions and what you said, maybe it would be worth it to ask a third party for feedback?