When I was about your age I would get chest pains and later thought I had heart problems. Instead it turned out that I had gluten sensitivity (Celiac Disease), gall stones, many parasites and toxins in my body. I started using Hulda Clark 's programs and supplements - killed off many parasites, strengthened my kidneys so I would excrete toxins more efficiently, and did many liver flushes. The Liver Flushes cleared out lots of cholesterol and I noticed as I got older that this lowered my blood pressure. Dogs carry heartworms and they can infect humans. They are easy to kill off using almost any parasite herb formula and could be one cause of your symptoms. Part of the chest pain I had was due to gall stones which came out with the liver flush.