Response:

I loved your account of awakening to your true self and being suffused with joy and peace. 

The knot of energy you describe reminds me of the Brahma granthi, which is a subtle knot of energy in the lower abdominal area (granthi means knot in Sanskrit) which deals with the deep, often unconscious instincts and attachment to physical survival and protection. 

This knot restricts the free movement of awareness toward greater expansion and expression. 

I do not believe that this sensation in your solar plexus area is causally related to or that it is contributing to your heart condition.

What you have been guided to do already is exactly what you should be doing—lovingly envelop the sensation with the presence of your awareness, neither trying to get rid of the sensation nor encouraging it. 

Just benign acceptance. 

This spiritual, non-judgmental embracing will loosen and dissolve the knot over time. 

The other thing I might add is that in the Yoga tradition, there is a technique called jalandhara bandha that is specifically prescribed for helping release the brahma granthi. 

Check it out online and on YouTube, and if you feel it would be helpful, you can try it out.

Love,

Deepak