I was hoping you could help me pinpoint what is wrong with me:

about 10 weeks ago, I began having sensations of heart palpitations. Shortly after, I began experiencing light-headedness and pains ranging from my breast area down to abdomen. I would almost always have one or more of these symptoms present and physical exertion would make them worse.

I went through a series of heart-related tests and nothing showed up.

In the time since, I have also at varying times and to varying degrees, began experiencing headaches, nauseau, and most recently nubmness in my face.

I don't have the strength or energy to make it through the day, and where 3 months ago I could run and ride the bike, I can no longer do either.

I was recently tested for pheochromocytoma and came back clean.

I have mentioned to my doctor that I fear this could be a fatal progressive deasese such as cancer. He thinks it may be an anxiety disorder.
Granted, I am very anxious right now, but with all these symptoms and no diagnosis, how could I not be?

thank you