Have you consulted your doctor about your symptoms? Your doctor would be able to determine what contributing factors could be behind your breathlessness while exercising, nausea and insomnia.
Please let us know how you're doing and if your doctor was able to pinpoint any causes for you.
Is there some specific information you would like us to research for you, in the meanwhile?
There is also study on chronic angina being conducted by one of our resources: AWARE Clinical Research Study and you might see if you qualify for the study by reading the FAQs