Have you been able to see your doctor yet?

The ER was right to suggest you see your doctor, since their function aside from life-threatening emergencies, is to admit a seriously ill person or to stabilize an ill person until they can be seen by their own doctor who knows them best.

Another ER visit will likely be the same.

I hope you can get in to see your doctor soon so you can begin the course of finding out what's going on and the treatment for it that you need.