I'm so sorry for your ER ordeal!! I think everyone has interesting stories to tell of trips to ER.
Those ER docs shouldn't be trying to manage your UC< they don't know your history. They are there for emergency treatment only. They need to leave the management up to your GI. Definately be calling him soon. Its so hard when they throw a bunch of new meds at ya, to determine which is working well, and which one causes problems. They probably should start new meds slowly, rather then just giving you a bunch and telling you to start them. But, it definately sounds like your system won't tolerate what you took. I hope you continue to improve!!!