I recently got an ADHD diagnosis as an adult, and similar to you it was a "no doubt, you 110% check every box in every aspect of your life" from both my therapist and psychiatrist.
My therapist obviously can't prescribe, but I have a fantastic relationship with them, and they did convey that they think I'd probably be a better fit for non-stimulant ADHD meds based on some of my other behaviors. My doc, however, started me on Adderall ER because I guess that's the standard medication to start ADHD patients on.
But I got some crappy side effects, kind of how you're describing: elevated heart rate, some nausea (especially if I didn't eat enough). My therapist was worried about some of the emotional intensity stuff, especially with stress and caffeine, but I felt like I was managing that okay.
In any case, my doc wanted to start putting me on _additional_ meds to counteract the side effects. Therapist was still prodding for non-stimulant (but I'm a bit skeptical of SNRIs in general, maybe a bad bias...)
But I really pushed to just....reduce the Adderall dosage. Doc knocked it down twice, I ended up at _half_ the initial dose, and now it's just _awesome_. Most of those side effects have gone away, I'm still getting the benefits I want out of it, and unlike a lot of other meds, I can choose on a daily basis whether or not I feel like I'm going to need it.
Obviously, I'm not your doctor, and I'm sure you did your due diligence far beyond what I'm offering here. But I did want to share my experience in successfully shaping medical decisions with multiple expert and personal inputs. Ultimately, I landed on a medication path that's been EXTREMELY beneficial for my happiness and productivity, and it was one that wasn't initially suggested by either professional.