Thanks for your question on Health Care.
I can understand your concern.
At present, no need to worry for heart diseases because your
nuclear stress test is negative.
But better to get done ecg, 2d echo and stress test annually to know your heart condition.
In my opinion, your current symptoms are mostly due to stress and
anxiety.
So better to
consult psychiatrist and get done counseling sessions.
Try to identify stressor in your life and start working on its solution.
You may need anxiolytic drugs too.. So avoid stress and tension, be relax and calm.
Don't worry, you will be alright.
Hope I have solved your query.
I will be happy to help you further.
Wish you good health. Thanks.