It would be a good idea to see your doctor and lay out all these symptoms, so the doctor can decide which tests to run.
He or she might order an EKG, a chest X-ray, a treadmill test (those three would be to check your heart), and some blood tests to be sure you aren't low on key elements and don't have thyroid issues or diabetes, and possibly will discuss what you are eating to check to be sure the dizziness and fatigue are not from your diet being low in something you need.
Have you had a lot of stress before this started? Stress can contribute. No cigarettes or nicotine vaping, right?
This condition is more common in Japanese. You can show this reference about prevalence in Japanese to doctors, it's from what's called an 'authoritative source' so a doc should respect this site:
https://emedicine.medscape.com/article/153943-overview
"Overall, Japanese patients are much more likely to develop coronary artery vasospasm than Caucasian patients. When evaluated by the same team, Japanese patients had a 3-fold higher incidence of spasm than their Caucasian counterparts..."
Your EKG (heart test) will probably be normal, **except** when an spasm attack is actually happening. So you need a test where they inject a certain chemical to see if that triggers a spasm attack.
Your name ends with "ko" so you are probably female, neh? Females are more likely in general to have these heart artery spasms.