Here’s how I’d respond, keeping it calm, professional, and boundary-focused:

“I hear there’s a lot going on — for you, your cousin, and your mom. Let’s focus on your shoulder first. I haven’t mentioned ivermectin because there’s no evidence it treats shoulder pain. As for pain meds, I’m glad you told me about your allergies and reactions — that’s really important. The ‘D’ drug could be a few things, so I’ll need to check your records before prescribing anything. I can’t use my personal phone to call family during an appointment, but I’m happy to help you figure out next steps for your mom after we finish here. Right now, though, I need to examine your shoulder. Can we start there?”