attacks with hyperventilation
could cause these symptoms. You are wise to go to the ER since they can also be caused by a heart problem. If nothing heart-related is found while you are having the symptoms, and nothing is showing up on any tests, then I would be suspicious of hyperventilation. I recommend that you discuss these symptoms and have an examination with your regular doctor. Ask about anxiety and hyperventilation. Your regular doctor sees the whole picture and knows you best. He or she can evaluate your problem better than a specialist at this time.
Hope I have answered your query. If you have any further questions I will be happy to help.