Hi, Cheekybull, and welcome! I have that pain behind the breast bone. When I press on it, it is tender...like I was badly bruise there. I also get pain around my rib cage and all this makes it difficult to breathe. If this is what you are feeling, you might have costochondritis. My doctor has me taking ibuprofen with food for this and it does help. Here is a link about it. See if it sound like you.
http://www.mayoclinic.com/health/costochondritis/DS00626
I too get the hear palpitations. When they first started, I was thoroughly checked out by my Internist to make sure I wasn't having heart problems. He did an EKG, echocardiogram, an ultrasound of my heart, and had me wear a monitor for 24 hours. I had no heart problems at all so it was fibromyalgia doing this.
Be sure to check out the Fibro 101 thread...the first thread on the forum. There are links to good information about fibro and you will learn a lot there.
I'm so glad that you found us and joined in. Read back posts and don't hesitate to ask questions. We are here to help you. Hope to hear more from you soon.
Sherrine