I would definitely go to the ER, as kjohns said, when it comes to your life, every trip is worth it.
I remember when mother had CHF, she would be OK sometimes in the morning, then BINGO, at night, without warning, she would get short of breath and we would have to rush her to the ER, sometimes this happened even after she had been earlier.
So, not to alarm you, but just because all is calm now, doesn't mean it won't act up later, it can be sneaky.
We are all here for you, you are not alone, I know I am sure thankful for these groups.
When it comes to your heart, you need to go in to the ER, just to make sure that everything is alright. I think everyone on this website will tell you that every trip is worth it, because life is too important not to take seriously. I am 32 with heart rhythm problems and everytime I am having PVC's I always go in. I wish you the best of luck and I hope you get better. We all need to help each other, because for some of us there is no one else out there that knows what we are really going through. I know that when it comes to the heart or any other serious problems, it can be really scary. But you are not alone, again I wish you the best.