A psychologist can administer a test. And help you develop a safety plan for you when you feel like self harming or are having ideation. A psychopharmacologist can also diagnose and they can prescribe any meds, as needed.
I would think the pros in having a diagnosis and being under treatment are that it's a path towards wellness and to also give you peace of mind so that you needn't agonize over the "what is its".
I think it's hippa that protects your privacy from outside persons finding out if you have an illness.
I'd think that being in treatment might be less of an employment hinderance than if not, by virtue of attending to your health.