Thanks for your question on Health Care Magic.
I can understand your situation and problem.
By your history and description, possibility of
stress,
anxiety and panic disorder is more.
Since your cardiac work up is normal, no need to worry for major heart diseases.
Your all 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.