Are you frightened of making a fuss? Do not be. The first time I had a gall stone attack, I thought I was having a heart attack, despite the pain being on the opposite side of the chest! My DH called an ambulance, which came in 10 minutes, by which time I was fine and embarrassed. But they were having none of it. Although it was obvious I was ok, they insisted they took me to hospital to be checked over. Everyone said I should not be embarrassed. They would rather people get themselves checked and find out it's not a heart attack, than be frightened of making a fuss and dying! This was said to me several times. So what if this is a panic attack? You need to know what you are dealing with. As the others said, phone 111 for more immediate reassurance, but make an emergency appointment to see your doctor. Do not be embarrassed.