APA dictionary of psychology have a definition of affectivity: the degree of a person’s response or susceptibility to pleasure, pain, and other emotional stimuli. Evaluation of affectivity is an important component of a psychological examination; the therapist or clinician may look for evidence of such reactions as blunted affect, inappropriate affect, loss of affect, ambivalence, depersonalization, elation, depression, or anxiety.
Currently modeled as a subtype of Finding relating to grief and dying (finding)
Merriam Webster has the following definitions of agony:
1a: intense pain of mind or spirit : extreme distress : anguish <the agony of being found wanting and exposed to the disapproval of others — Margaret Mead>
1b often capitalized : the sufferings of Jesus in the garden of Gethsemane <and being in an agony he prayed more earnestly — Luke 22:44 (Authorized Version)>
2a: intense pain of body : extreme torment : torture <left arm twisted upward behind him … in slow, deliberate agony — Kay Boyle>
2b: the throes of death : death struggle <his final agony>
3: a violent struggle, conflict, or contest <the world is convulsed by the agonies of great nations — T. B. Macaulay>
4: a strong sudden and often uncontrollable display (as of joy or delight) : outburst <my cousin … in an agony of mirth — Edith Wharton>
Consider:
Inactivate Is a Relationship: Finding relating to grief and dying (finding)
Add Is a Relationship: Distress finding (finding)
Add SYN: Extreme distress
Add DEF: Intense, negative experience typically occuring in the context of intense physical or emotional pain as often occurs in the context of impending death and extreme emotional trauma