I'm sorry you're going through this. As someone with OCD, I can relate to a lot of what you've posted. I think everyone has misheard things from time to time, or seen something out of the corner of their eye that wasn't really there when they turned their focus on it. Because we have anxiety, we're constantly monitoring for threats that aren't really there, and sometimes your imagination, as Billie puts it, fills in the blanks. I don't have schizophrenia or any other psychosis, so if someone who does experience these symptoms knows differently, they can feel free to set me straight, but from everything I've read about hallucinations, you would be hearing/seeing them very clearly, as if there were another person in the room with you. It wouldn't be a question of, "What was that? I think I heard something."
I still struggle with a lot of the same fears you have, so it's a process. One thing that a lot of people around here will tell you is to stay away from Dr. Google - researching your symptoms is almost universally bad, because you'll start convincing yourself you've got everything under the sun. It's hard to avoid the temptation, but it's better for you overall. Try to keep in mind that your doctor has studied, and he's trained to see signs of illness in people. If he doesn't see those signs in you, that's a good thing. Try to keep that in mind.