You may have recourse, though it's not as simple as the ADA advocate seems to have made it sound to you. The judgment is not void at this point, though it may be voidable if you take action.
You can file an appeal, and in the appeal you will need to prove that you have a disability under the ADA, that you properly proved to the judge that you have such disability, and that the outcome of the lawsuit may have been different had the judge properly accommodated you per your request. As an aside, the accommodation must also be reasonable.
As a separate matter, you may also wish to sue the County for violating the ADA. This would be a separate lawsuit since it wouldn't depend upon the merits of the previous lawsuit, and instead the only issue would be whether the judge violated the ADA by refusing to accommodate you.
My suggestion is to retain a local attorney who can take legal action on your behalf. Dealing with these two issues on your own will be difficult and require an experienced litigator and researcher.
Does that answer your question? Please let me know if you need clarification, as I am happy to continue helping you until you are satisfied. Also, please remember to provide a positive rating via the stars (and note that your positive rating is the only way that I'll get credit for helping you, so it is much appreciated!). Thank you. :)