How terribly frustrating an ER visit is when it solves nothing and increases stress.

That said maybe a few ideas for future:

Write down all your meds on a 3x5 index card.
Keep it updated whenever you have a change in meds
Put it in your wallet with your health insurance card.
Your neuro's name and contact info should be on the card.

Additionally, I would make apt with your neuro now. Address the changes in status you have. And then try to get his/her input about what you can do to manufacture a better outcome with the ER staff in future. Is there something that he can put in your Hospital file that would cause them to get their 'act' together when/if you have to go to ER. (IF you handle it right, some neuro's get annoyed when ER staff refuses to contact them and get it corrected off line. Other neuros could care less. Hopefully, yours is one of the former!)

Hope you feel better soon.

PS. You have a much better chance for a good outcome in an ER if your doc has privledges at that hospital.