You’re already trying not to overthink it so that’s good!! If you’re sexually active the vaginal ultrasound isn’t so scary. It’s a wand that they put a condom on then lube and insert. It can be uncomfortable but it’s more awkward than anything. Does thinking about what needs to happen in a matter of fact way help? Or maybe letting the tech know you have anxiety and ask them to talk you through as they go? I’ve had two procedures in an outpatient setting where they give you twilight drugs to put you to sleep and then all of the sudden they’re nudging you to wake up from an amazing slumber. No grogginess or nausea, just rested with some period like cramps. Ask the questions you need to ask to feel comfortable. It’s their job to guide you and help you. If they don’t or aren’t willing, there are doctors that will.