The symptoms of a panic attack can be extremely similar to the symptoms of a heart attack, and it can be very difficult to tell them apart. If you are in doubt, you should always visit an emergency room as soon as possible, because every moment counts if you are indeed having a heart attack. When you have a panic attack, you may have a racing heart, nausea, lightheadedness, chest pain, difficulty breathing, palpitations, and many other symptoms that are very similar to heart attack symptoms. This can be really scary, and that fear can make the symptoms spiral out of control. There's no really reliable way to figure out whether you are having a heart problem or an anxiety attack, which of course makes it difficult to decide what you should do. On one hand, if it is a heart attack and you do nothing, you could seriously damage your heart or even die. But on the other hand, if it's just a panic attack and you rush to the emergency room, it can be very embarrassing, and it will cost you time and money.
I advise taking your symptoms very seriously and seeing a doctor immediately the first couple of times. Even if you think it's just anxiety, it's better to get checked out so you'll have at least that peace of mind. The emergency room doctor can do an EKG to determine if you have any heart issues. If not, then in the future you can be reliably certain that you are simply having a panic attack.
You can also check your lips and fingernail beds for blueness. If your lips and fingernail beds are pink or pinkish, you are probably not having a heart attack. This will hopefully help you figure out your true issue, so your symptoms do not spiral out of control in fear for your life.
If you have been recently checked and it was determined that your heart is in good condition and you have normal blood pressure and no other health issues, you may need to try some techniques to calm yourself. If you use various breathing techniques and relaxation techniques and they do not ease your anxiety, you should get checked out by a physician. If the techniques work to minimize or eliminate your symptoms temporarily, you can be reliably assured that it's only anxiety.
Once you start to realize that what you're feeling is simply the effects of anxiety, you'll find that you have fewer of these issues, and those you do have will be much easier to control.