Empirical proof that holding on to grudges , not forgiving helps foster diseases and maintain them.The Torah has told us eons ago to let things go
"you shall not hate your brother in your heart.." Leviticus 19:17
"you shall not take revenge and you shall not bear a grudge.."Leviticus 19:18
and many more verses
Trust in G-d and forgiveness will come easier to you...forgiveness does not mean "that you let someone get away with it" but you are allowing yourself to move forward in healing ,health and positive growth...
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Unforgiveness is classified in medical books as a disease. According to Dr. Steven Standiford, chief of surgery at the Cancer Treatment Centers of America, refusing to forgive makes people sick and keeps them that way.

With that in mind, forgiveness therapy is now being used to help treat diseases, such as cancer.

"It's important to treat emotional wounds or disorders because they really can hinder someone's reactions to the treatments, even someone's willingness to pursue treatment," Standiford explained.

Of all cancer patients, 61 percent have forgiveness issues, and of those, more than half are severe, according to research by Dr. Michael Barry...

"Harboring these negative emotions, this anger and hatred, creates a state of chronic anxiety," he said.

"Chronic anxiety very predictably produces excess adrenaline and cortisol, which deplete the production of natural killer cells, which is your body's foot soldier in the fight against cancer," he explained.