The heart is a muscle, yes; but...the consolation is that even though all of our muscles hurt, there is no damage in our muscles.
I have had fibromyalgia for 35 years and I have had SEVERE muscle pain in every part of my body. But when tested, the muscles are fine.
I would imagine the same would be with the heart. Our anatomic nervous systems are just haywire...all coming from the brain sending incorrect signals to our body parts.

Thank everyone.My DR never mentioned any further tests just to get in touch if it gets worse!

Please see a cardiologist. You can be hooked up with a Holter monitor which you wear home for 24 hours. That constantly records your heartbeat and any irregular beats that occur could be seen... An overactive thyroid can also cause similar symptoms.

I get irregular heartbeats also. The heart is a muscle. Fibromyalgia is a neuro-muscular illness that can affect muscles throughout our bodies. The heart is not immune. It is very frightening, I know. When I am flaring, the palpitations are much worse. It is a revolving cycle because the palpitations make us frlghtened which in turn make the irregular heartbeats worse. Do see a good cardiologist though to rule out underlying heart disease or an electrical problem. Hugs....

Thanks everyone for kindly replying to my question It looks like i needn't worry too much now.Hugs to you all.