Ick. Sounds like you need to read a bit more about epistemology. After you have torn everything apart you get a more solid grasp of how to build some semblance

Ick. Sounds like you need to read a bit more about epistemology. After you have torn everything apart you get a more solid grasp of how to build some semblance of a system up again. Here's my suggested reading list: Plato to establish a foundation, Descartes's First Meditation (edit: or the skeptics, but I don't really feel the need to subject non-philosophy students to that) to tear it down, Kant to give you a more rounded view (but be careful to note where Kant fails as well), Hume to bring reasonableness into being, Nietzsche to round out the pitfalls of nihilism, and some Neo-Kantianism, evolutionary psychology, and modern ethics to round it out.