What yoga exercises or Ayurvedic treatments can help with heart pain and rapid heartbeat during strenuous work at age 83? - #53841

I am 83 years old and in good health, but have problems with my heart. In normal condition my heart is in good condition, but as soon as I do some strenuous work e.g. garden work, especially bending down - i get pain in my heart and my heart beats quickly and I feel uneasy and have to sit down, I also get a slight headache. My BP stays normal. This problem  gets acute when I have to work bending down. Can you kindly suggest some yoga exercises, mudra or ayurvedic medicines or special diat? Thanks.