grooviegurl

Not to be that guy, but can you verify this somehow?

Not a lawyer, but if you are your own person (if you do not have a guardian and if you have not been declared to require a medical power of attorney to make your healthcare choices for you) I would think that yes, you would still be allowed to make that decision. If your cognitive decline is related to your terminal diagnosis, especially.

I'm reminded if the young last with the brain tumor from Washington State. I think her situation was kind of similar to yours (with the brain being effected, at least).