I am so sorry you have had these bad experiences. You are probably correct that the people doing the FBAs (and they're not called anything in particular, because they could be school psychs, BCBAs, special ed teachers, SAC, SSW, or GCs, among others--often they are behavior specialists, which is not a specific field) are used to doing them with ADHD, ODD, ASD, or emotional impairment as the lens. One of the issues is that many 'behavior specialists' without any certification just have a bachelor's in some education or psych-related field, and one more course on behavior. And since there are no specific qualifications necessary to do an FBA, districts can put whomever they want on it. Where I've worked, they've been done by school psychs or BCBAs (who are sometimes the same person). Sadly, this is not the case everywhere.
The tunnel-vision resulting from training narrowly-focused on the top few situations that call for FBAs is one of the big reasons that I would inquire about the specific qualifications of an assessor before agreeing to an FBA. When I conduct them, I always seek input from the parents and the child, rather than going only on my own or the teachers' perceptions. And I absolutely consider medical factors as a possible setting event, including asthma, allergies, medications, sleep hygiene, etc.
