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If your tests are abnormal, then your treatment depend on finding of test reports. If cardiac sarcoma
is suspected, then there should be some finding on 2D echo.
Apart from that, there is need to rule out anxiety
disorder in your case, specially considering: Difficulty in reaching diagnosis in spite of several tests, palpitation
and history of narcotic addiction
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal