Depression and Diabetes with delusions

Dear Members,

I am seeking advice regarding my fathers health condition, which has been concerning us for the past 1.5 years. He retired in March 2023, and his health has since deteriorated both mentally and physically. Below is a detailed description of his condition:

Mental Health Symptoms:
Post-Retirement Emotional Struggles: Initially, he had daily crying spells and was constantly worried about how things would work out for us as a family.
Agitation Episodes: There were periods during the day when he would become highly agitated (lasting 30 minutes to 1 hour), finding it difficult to sit still.
Social Withdrawal: Over time, he stopped wanting to meet people and has now become completely socially isolated. He does not respond to anyone except family members.
Delusions: He frequently expresses beliefs such as:
God has oppressed him and is cruel.
Nobody is eating or drinking anything, yet people are still alive.
There isnt enough water on Earth for everyone to survive.
Noncompliance: He refuses to visit doctors or follow any suggestions, becoming angry if we insist.
Physical Health Symptoms:
Diet:
He only takes a liquid diet consisting of 2 eggs and 4 glasses of milk or yogurt daily.
He refuses to eat any solid food.
Sedentary Lifestyle:
He lies in bed most of the time and avoids activity.
Blood Sugar Levels:
Fasting blood sugar: ~150 mg/dl.
HbA1c: 8.3 (indicating uncontrolled blood sugar).
Past Behavior:
Before retirement, he was a very aggressive person by nature. This behavior has changed drastically over the past 1.5 years, evolving into social isolation and emotional detachment.

Current Challenges:
He is socially and emotionally disconnected.
He refuses treatment and is noncompliant with any advice.
We are extremely worried about his mental and physical health. If anyone has encountered a similar case or can suggest effective homeopathic remedies, please help. Your guidance and recommendations would mean a lot to us.

Thank you in advance for your support!