Hi, and welcome.
I'm not raising a grandchild - but my kid is another "alphabet soup" list of diagnoses.
You may be dealing with more than or something different than the diagnoses given. We sure were. We found that ODD was not helpful as a diagnosis - there is no treatment for it, really, but it did work as a "placeholder", essentially acknowledging that there is something going on and that we still needed to keep finding the root cause. ADD/ADHD is often either co-morbid with other diagnoses, or may be incorrectly diagnosed. And Anxiety Disorder can be a stand-alone diagnosis, or co-morbid, OR a symptom of other missing diagnoses, because the kid doesn't know what is going on either, and being a misfit tends to produce anxiety. We've been there!
Who provided the diagnoses? We had to keep fighting for additional layers of testing, until we got down to root causes. With root causes identified, we are making some progress.
If a medication is causing the child to become unstable, it would probably be worth pursuing other alternatives.
