While panic thresholds may be less frequent, anxiety may continue to persist at levels certainly capable of disturbing the nervous system.

The content of your posting is clearly significant for anxiety and worry. Subjectively trying to measure your level of anxiety and making comparisons can quickly lead to frustration.

You need to focus upon working through the anxiety, regardless of what form it exists to cause physical symptoms.

Finally, this condition will never damage your heart nor cause you to "drop dead" as a consequence of any synergistic effect from other disorders that may arise. You are experiencing symptoms only, which are not damaging your heart in any manner whatsoever.

Best regards and Good Health

Well, many people believe that the answer is to "forget" about their worries. In truth, this is not possible. The actual key is developing proper perspective based upon a factual interpretation of issues regarding your life. For example, people who have health anxiety typically suffer because they misinterpret physical signs and use subjective reasoning to develop a perspective, which often serves as the source of their anxiety. For example, if they use subjective reasoning to believe that they may have cancer, then the fear becomes very real. This misinterpretation is reinforced by exposure to media information about symptoms, etc. that are quickly paired with symptoms the person may be sensing, causing fear and alarm to become even more elevated. It must be remembered that this entire process virtually always takes place in the absence of medical training to discern actual circumstances from those perceived.  

Once this process is firmly entrenched, emotions begin to weigh in and the person's outlook and desire to engage in activities such as hobbies, social gatherings and even occupational endeavors,  can become greatly diminished. The person feels that it's no longer worth feeling excited about life and things ahead in life if that life is imminently threatened. They become overly cautious about undertaking physical activities because their bodies feel "fragile" and inacapable of performing without inducing complications, possibly even death.

Imagine the quandry; Afraid of death, afraid of life.

It places a person in jeopardy regardless.

The key is perspective. If you've been given a day, then embrace it and make it all that you can. If you're given another, treat it as an even greater benefit rather than with complacency. Remember that physical existence is merely coincidental to the actual intent of life.

You have a long life ahead of you. Never spend time worrying about how long, but rather what kind of life.

Worrisome anxiety is actually a feeling of loss of control in some respects. So don't let your mind play tricks on you and when presented with a situation that typically invokes worry or anxiety, use intellect to break it free from subjectivity, analyze it for factual basis, make a determination about your options and then take action to make it work to your best possible advantage.  

You're going to be just fine.

Best regards and Good Health