I'd say you might've found yourself in a bit of a logical pickle: if you can't use rational thought to know something, then you can't use rational thought to know that you can't use rational thought to know something. I'd be curious to hear your logical steps on how you got where you are.
Yes, it would probably be so much easier if I'd just come to a different conclusion. My problem with reasoned thought as a basis for knowledge is that everything is relative then and there can be no actual knowledge. Everyone thinks about things differently and your reasoned truth is different from mine, but both can't be truth, unless we scuttle the meaning of the word.