Here's a few meds my lovely neurologist at the Mayo autonomic disorders program and I discussed that I would recommend looking into, depending on your specific causes of dysautonomia and comorbidities:

- guanfacine if you have brain fog/ADHD and hyperadrenergic subtype and tend towards high bp (which it sounds like you may not have given your poor response to beta blockers)
- pyridostigmine if you have dysmotility/GI issues/constipation, helps with venous return
- midodrine if you have hypovolemia and tend towards low bp
- mirtazapine--not exactly sure how it helps with dysautonomia but good if you have GI issues too and could help with depression/anxiety. also puts me to sleep
- ivabradine if your HR is too high after beta blockers
- B12, folate, iron, D, calcium, etc. only if you're deficient
- of course tons of salt and water and compression as you're probably very familiar