In Germany? :o

As a diagnosed German I can tell you not much changes, there's virtually no therapy for adult autistics. I understand why your doc said that.

Though there was one large benefit for me and it's that after we applied for disability the Arbeitsamt got much more lenient with me and was actually useful in helping me find a job.

In the end, if you can't let go, seek the diagnosis, if not, take from autistic communities whatever little tricks help you, discard what doesn't and call it a day. Much less trouble :)