"Psychosomatic" doesn't mean the illness you're experiencing is "just all in your head."
Psychosomatic means involving both the mind and the body, or symptoms caused by mental or emotional disturbance. Psychosomatic illnesses are very real ... and often life-threatening as well.
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"Still holding grudges? Check your pulse: research suggests that harboring feelings of betrayal may be linked to high blood pressure which can ultimately lead to stroke, kidney or heart failure, or even death."
That comes from an article, Forgive to Live. Let go of that grudge for your own well-being: The link between forgiveness and longevity in Psychology Today.
"A new study from Duke University Medical Center demonstrates that among people who have chronic back pain, those who have forgiven others experience lower levels of pain and less associated psychological problems like anger and depression than those who have not forgiven.
"Forgiveness in this context is understood as a person's act of deliberately giving up anger and resentment felt toward an offender, and fostering qualities of love, understanding, and compassion in their place." -Medical News Today
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"In your anger do not sin" : Do not let the sun go down while you are still angry"
-Ephesians 4:26
"Get rid of all bitterness, rage and anger, brawling and slander, along with every form of malice."
-Ephesians 4:31
"Do not take revenge, my friends, but leave room for God's wrath, for it is written: "It is mine to avenge; I will repay," says the Lord." -Romans 12:19