Anguish is the symptom that produces the Solar Plexus Block to such an extent that it entails that you do not accept, even your own love.
The scientific explanation would be: "that the Energy that should flow from the Heart Chakra to the Solar Plexus, of the person in question, is blocked in the upper part of the Solar Plexus, bouncing backwards and accumulating in the chest ... even affecting the Throat Chakra.
It is when you feel the Anguish that causes you fear and this the subsequent symptoms.