May I offer a different perspective?
Let me say up front, "BS dumping" does occur. And we all need a safe happy place to blow of steam.
On the other hand, EMTs and paramedics often do not have the knowledge to diagnose a pt with BS. But some do, and get no feedback that they were wrong, so they assume their diagnosis was right. I saw a pt last month for "headache, resolved." The pt was triaged to fast track and waited almost 2 hours to be seen. I read the run sheet before seeing the pt (yes, we DO read them) - it started by saying the pt's doctor ordered a CT head for headaches that morning, and in the afternoon the doc called to tell the pt the CT was abnormal and to call 911. It went on for several lines about the pt having no pain, carrying own suitcase, headache resolved with Tylenol, etc. The phrase "in no distress" was written 4 times, including once in all caps and the height of three lines.
Tylenol may resolve the pain of head bleeds in some cases, but doesn't fix the bleed in any case.
I took it up with the crew the next time I saw them, and the cocky kids saw nothing wrong with how they managed the pt. No stroke sxs, so how were they to know? My point exactly - if you don't know, don't assume you know.
My advice (for what it is worth) is to make a habit of following up on your patients. Find out who in the EDs is open to talking to you guys so you can find out if your pre-hospital hunches are correct. You'll learn from this - if you remain open to learning - and will have sharper judgment. You can also identify trends of BS dumping, substantiated by ED records, making any formal complaint you bring more likely to be taken seriously.