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From your history it appear that your father need assessemnt and treatment for psychological problems and hormonal
imbalance. Continue treatment for acidity.
He already has multiple stressors like poor relation with wife and you. Psychological issues may also be reason for worsening of relationship.As he is loosing weight then it is advisable to seek psychiatrist
help as soon as possible.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal