Valerie, you did the right thing. If it happens again or gets worse - go back to ER again. Your life is more important than the insurance/assistance and the rest of it.
I'm glad you got checked out. Sometimes that is a comfort - just to know what your body is trying to tell you.
Please do as others here have said - take it slow. No exertion. Thankfully, you have a surgery date, so it's good to have that to focus on. Surgery is scary for all of us, but knowing there is an end to the symptoms and weird things our body can put us through in the meantim - well, personally, I prefer knowing there is an end to that.
Take good care and keep posting to let us know how you are doing, ok?
Kev