Same here. It is frightening because the first thing we think of is the heart. I would get your heart checked of course, but if it comes back clear you can safely say it is heavy metal toxicity and yes, is part of some cases of candida. Do you drink alot of soft drinks as a matter of interest?
Anyways, for the metals, get yourself some fresh Cilantro from the grocery store and start chewing handfulls of it daily. Drink lots of water alongside this to help cleanse. See if it helps after a week or two.