I must be stupid but I don't know how to see my sent PMs at all. I see a part that says "sent messages" but it's empty, and I know I sent a few of them this past week. Any help would be appreciated.
Personal Messages aren't kept by default. There's a check box below the text field that says "Save a copy in my outbox". You've got to check it in order for PMs to be kept. Note that you can make it selected by default in your account settings.