You are characterized by serious subjective symptoms and normal objective examination. You are only 35 years old. Generally speaking, the possibility of coronary heart disease is small. If you are still worried, you can do a coronary CT or coronary angiography. If it's still normal, you can rest assured.
Even if these tests are completely normal, excluding the possibility of organic heart disease such as coronary heart disease, it does not mean that your illness will be fine. This is just to further prove that you are a cardiac neurosis, and you need related treatment, mainly psychological counseling (so-called heart disease or cardiology treatment). It will take time to recover with anti-anxiety drugs in the psychological counseling clinic.