When I was counseling people nutritionally, I would tell them to get a diagnosis for anything that seemed to be of a serious nature. Not being a doctor, I can't diagnose. I could have been sued. Sometimes something innocuous can be something serious. Probably not the case with you, your young, and it seems like a relatively minor issue. But you don't know. You should get it checked out.
That being said, I don't know your diet, but it would probably be beneficial if you cleaned it up a bit.
Also, oxygen supplements, CoQ10, aged Garlic, Prime Rose oil, Goldenrod are all supplements that help increase oxygen blood flow. Miror EPF, you can get it on Amazon, has been helping people with circulation issues.
Food grade 35% H2o2 can increase Oxygen flow, but you have to carefully read the instructions and build up to a therapeutic dosage.
Also many Americans are deficient in magnesium which helps regulate heart rhythm; so it can influence blood and oxygen flow.
Essential oils that may be used for clogged, hardened arteries include Rosemary and Juniper.Essential oils that aid circulation include: basil, geranium, lavender, neroli, pine, thyme, and vetiver.
There is a small chance it could be a mold or yeast issue.
As far as the emotional and stress issues, that is something you may want to look into.