I was on coreg, ACE-I, spironolactone, asprin etc. With 12.5 mg x2
coreg and 5mgx2 ACE-I daily I was doing well with my walking
and heart condition was more or less stable. Four months after MI I changed my cardiologist and he advised to increase coreg gradually to 25mgx2 daily. I have reached a level of 18.75mgx2 daily in next one month. Thereafter I lost my capacity to walk by half. While walking as soon as my pulse goes beyond 105 bpm I start feeling lightness in head, tired and low.