If you want to be 100% honest, and have 100% integrity.
If your company is in trouble, chances are that they will understand that you are looking for another job.
It could well be that they are willing to let you go on good terms to avoid a redundancy payment.
Ask them for a reference that includes your illness, that you have made a good recovery and that it does not currently impact on your work.
I am not sure what the US employment laws are like, probably similar to Australia in some respects.
Employees cannot provide false statements in their resume. That includes lying through omission.
Health problems that impact your work, you must declare to the prospective employer.
One option is to get a medical, and if it is deemed that your medical condition will not impact on your work and you have a clean bill of health you do not have to declare your condition.
I would suggest that you would probably pass.
I currently employ 50 people and have probably employed over 300 people in the last 25 years.
If I saw that on a resume it would raise alarm bells. It means you perceive this as a handicap, whether real or not.
If you perceive this to be a problem, therefore it is. Its probably time to move to your next level of healing which means mentally putting this episode in your life behind you.
Do ask yourself does this really impact on my work performance in comparison to the next person who suffers from, chronic migraine, vertigo, or smokes, depression, bipolar, heavy recreational drug user, borderline alcoholic, etc.... You are probably far better and much less risk, and I bet the people above would not put that in their resume.
Personally as an employer... I would leave it out. I think it would unfairly prejudice your chances of employment and your condition is minor. Would I care if I found out.. probably not, as long as it didn't affect your work in a major way.
If I need to performance manage you because of your AN symptoms yes I would be annoyed, and grumpy that it was not declared.
Most people come with baggage... as an employer we get that. Many people will not understand what an AN is and just hear brain tumour....therefore brain is defective...
Your tumour is done with, you would most likely pass a medical from an AN perspective. You don't need to tell them if you pass the medical, and they have no right to know.