When you prove, over time, that your clinical judgement is solid, they will stop questioning you on the whole- there will always be those who will question everything simply because it's more work for them. Best to just ignore those folks and move on.
I've had situations where nursing or medic bias can have a detrimental effect on patient care. Honestly, anyone who's worked in the ER long enough will have those situations as well- it's unfortunately a part of the job, and your job as a clinician is to get past that as much as you can and rely on your training and researching the answers for yourself, or asking your SP when you're in a tight spot- no matter how new your SP is.
And now story time!
My recent favorite nursing story is a gentleman who was from Nigeria, who was living with someone helping him get a visa. He presented to triage with a complaint of sore throat and inability to swallow, but still protecting his airway. The nurse who triaged him thought he was being standoffish because he wasn't talking, and she said "He is giving me this evil eye for some reason". Febrile and tachy, so something's going on. I go into the room and hear the classic "hot potato voice", and saw the worse peritonsilar abscess I've ever seen- I damn near couldn't see his uvula because it was so deviated. And this guy got put in fast track because "he's being standoffish". I asked the nurse to come into the room with me a second time, opened his mouth and showed her exactly why he "wouldn't speak to her"- just to help educate why some people aren't feeling particularly communicative, and that it isn't personal.
My two favorite medic bias stories:
Lady #1 was found down at her bar (yes, the bar that she owned) at 8 AM- was confused, lethargic and looked sick. Medics who dropped her off simply said "She was down at her bar- she's drunk". Problem is, she had absolutely no odor of alcohol on her. She ended up with full-blown active TB (no idea how she got it either)!
Guy #2 was, once again, found by medics on the sidewalk "Just drunk", so he got shuffled into a hallway bed. When I was finally able to go to him, he kept asking me the same question over and over, "So what happened"? (TIP- if they keep asking the same question over and over, DIG DEEPER for another cause- think intracranial. There is a difference between random drunk forgetfulness and true intracranial pathology causing amnesia). I rubbed my hand over the back of his head revealing a large hematoma with fresh abrasions. His rotational nystagmus suggested PCP on board. He ended up with a couple areas of intracranial bleed. Scary, because a cursory H&P of the guy, along with normal vitals (and he smelled of alcohol) would've missed some key details leading to the diagnosis.
All that being said.....understand that I know that there are amazing, hard-working medics/EMTs and nurses out there. I worked with wonderful medics and EMT's during my long EMT career prior to being a PA. But I also now know that I had no idea that I "didn't know what I didn't know"- and most of the time if you're able to take the time to educate people as to why you're doing the things you're doing, they will understand. And if they're still resistant and standoffish, then they're not worth more of your time.