IWTL how to be less annoying during appointments, as a patient

I'm just tired of making appointments for healthcare/dental care, and being high maintenance when I'm uncomfortable and/or very anxious before/during/after a procedure. Things can be overwhelming at times and sometimes panic inducing but I can't tell anybody about it. These feelings happen even when I'm not the patient, if I'm accompanying a family member I still break out into sweat, feel nauseous, sad, and spiral mentally.

I want to be less irritating, but don't know where to start.