Formal eval is generally gonna be expensive; you should look towards figuring out what public programs you qualify for, and then work towards getting diagnosed after you have coverage.

Instead, what you can do in the short term is go to a primary care doctor, tell them exactly what you put in your post body, and ask if they would be willing to prescribe any non-stimulant medications to help manage your cognitive symptoms while you work towards getting coverage and specialist care. Very few will say no, but if they do, it’s a reflection of what they consider their wheelhouse rather than you asking anything untoward.