Hi CB and welcome:) Palpatations are very common with anxiety...in fact if you were to do a search here at HW on them, you would literally find hundreds of posts on the subject.
However, it is good to get it checked out by your dr. as you are doing, because with any heart related issue, you need to rule out anything that could cause harm.
I am pretty sure that you will find yours are indeed caused by anxiety, and when you do, then you will want to get agressive in treating it!
Have you ever done any therapy? If not, I would suggest looking into it, specifically CBT. It is very effective in treating anxiety/panic and the resulting symptoms.
We also have a great Resource Guide (main page 3rd post) It is full of self-help suggestions and links, with relaxation and breathing exercises that you could get started on today!:)
Let us know what you find out from your doctor, and keep posting here with us, we understand what you are going through, and are here for your support.
p.s. we have had some members express that they have trouble reading posts in an all block form...if you could break your future posts up into paragraphs, it will be easier to read, and you'll get more responses:) Thnx!