If a conversation about quantum mechanics leaves you feeling bewildered, or lost and befuddled, don't feel bad: physics is a baffling and confusing subject.
Be- + wildered = "thoroughly gone astray, into the wild," which is pretty much what our minds do when we don't understand something, when we don't even come close to understanding it. If you're bewildered, you are confused on a whole new level. You may even find your confusion confusing. Great synonyms for this word include at sea, bemused, confounded, and mixed-up.