Diastolic dysfunction. This be reversed?

I recently had echo which says diastolic relaxation abnormality. I have mild breathing issues and difficulty lifting weights too. My blood pressure is generally 106/69 somewhere at rest. No diabetes. I'm under weight and have recently lost 10% of body weight. All cholesterol is under range.Have gone through CT angio too which came out normal post having mild positive tmt test in March'19. I want to know below 1- how dangerous is diastolic dysfunction stage 1 2- can this be reversed? Or how to hold the prognosis 3- what is the life expectancy with this condition. Please do answer this 4- how is it possible to have this condition by having no risk factors such as high bp Please do answer all the above 4 queries