I see paranoid delusions being the result of excess stress hormone production due to an inner biochemical abnormality that very often can be treated by nutritional means. When we suffer from delusions and irrational fears, it is because the body is producing excess stress hormones out of the blue - adrenaline and cortisol.
When you look at the function of adrenaline, it normally functions to ready the body for strenuous action in the face of some danger in the environment. But in a paranoid situation, no such danger exists in the environment, but is created in the mind of the person as the only possible explanation as to why we should experience fear without an object of fear.
People with unexplained anxiety attacks can become phobic, when they start to develop a specific fear - an unreasonable fear of something in the environment. Hence they can develop a irrational fear of elevators, or being in open paces or constantly worried about "closing doors" etc etc..
Thus it is the unprovoked production of stress hormones - especially adrenaline, a very fast acting hormone - that causes us to experience fear without a cause.
Now adrenaline function to convert sugar stores in the body - glycogen - into glucose. As explained in this Image. Thus the question is; "Why should the body suddenly have a need for glucose?" The answer is that the brain is the most sensitive organ in the body to any fluctuation in the supply of glucose as its only source of biological energy. The brain although 2 per cent of the body requires about 60-70 percent of all available energy, whether we are asleep or awake. A normal healthy cell requires about 2 million molecules of energy (ATP) per second to fuel biochemical reactions inside the cell. This is all derived from glucose in our food. Thus when the brain experiences energy starvation - glucose starvation - it will send a hormonal message to the adrenal glands to pour adrenaline into the system in order to supply the brain with energy again.
Now the question is: Why is the brain suffering from energy starvation? The answer is Hypoglycemia. Most schizophrenics suffer from hypoglycemia as one of the factors affecting their moods. Hypoglycemia also explains why so many schizophrenic resort to alcohol to medicate themselves against emotional turmoil caused by excess adrenaline. Alcohol is a temporary remedy against excess adrenaline! It calms them down. However, alcohol being itself a hypoglycemic chemical - lowering blood sugar levels - will worsen hypoglycemia in a person and consequently aggravate adrenaline stimulation in the end.
It is well-known that schizophrenics benefit from adopting the Hypoglycemic diet, as it will stabilise their blood sugar levels going to the brain. With more stable blood sugar feeding the brain, it will resort less to use adrenaline to rebalance energy levels and hence less anxiety attacks and delusions.
In addition, there is very good temporary remedy that can stop unstable blood sugar levels going to the brain, and that is GLYCERINE. Take one tablespoon of glycerine in a glass of water and a dash of lemon juice to improve taste, three times a day. It will bypass the pancreas in preventing the over-stimualtion of insulin (called hyperinsulinism) that can cause a sudden drop in glucose levels to the brain and should reduce the experience of delusions and hallucinations.
If problems persist I advise that you ask to be referred to a Nutritional Doctor.