Hi AW...the symptoms you describe are classic anxiety and since they stopped when you got closer to home I'm guessing that's what it is. But...if they persist or you are concerned be sure to see your doc. I always get a racing heart when I'm anxious, along with many other lovely symptoms.
Hey AW...I have suffered from anxiety/panic for many years. The attacks, for me, have come out of nowhere. One of the worst ones I ever had was one night watching Saturday Night Live. It just swept through me for no known reason. Sometimes they are a delayed reaction to something upsetting that might have happened a week before. When you listen to people who have anxiety, they will say things like 'I was just driving along..or I was standing in line at the grocery store..."
Again, if this worries you it is best to get it checked out for your own peace of mind. The real problem with panic attacks is that we tend to associate what we were doing when the attack happened and avoid getting in that situation again. I had an attack in a store once, and wouldn't go shopping alone for five years. It had nothing to do with the store.
Try not to dwell on it, or figure it out. It may never happen again.
I've had anxiety issues since childhood. I started having panic attacks at 17, I'm 64 now. When I lived in the city, I had panic attacks everyday, because of having to drive to work and back. Moved to a very small town 19 years ago. Don't get too panicky usually when I drive to a small city to shop, but I never vary my route--because I have no sense of direction--can't tell right from left. I do panic in Wal-Mart, always have, unless I go early on Sunday morning when it is fairly quiet and not very crowded. Still, if the crowds and the noise start before I finish shopping, I just don't finish. Sometimes I have to leave the cart and go home with nothing. I can't get out as early as I used to anymore because of fibro, IBS, osteo arthritis and sacroiliitis. Thinking too long about having to go to Wal-Mart causes anxiety for me. I only go now when I have to. They have run all the other stores out, and there are not many choices about where to shop. I know people who get anxiety in Wal-Mart and other such big noisy, crowded stores, and don't have anxiety about other things in their life.
I try to avoid the things that cause these feelings.
Thanks for posting this.