My echo & ct coronary is normal and tmt is positive. But i feel some discomfort on my left chest ,sholder,neck from stress( specially from emotional stress). Shortness of breath during hard exercises like running. Doctor suspect small vessel deases. Invasive angiography can predict it surely? This angiography is risky than profit? Stress related discomfortness improved not completely by anxiety medication.my risk factors are diabetes and elevated cholesterol. What's will be my procedure?