Our expert says:
This does indeed sound as though it might be a form of paranoia --- and of course the condition is very difficult to treat, because the person is so very suspicious, although it can respond usefully to medication. It is also typical that while they may have some very disturbed and unrealistic ideas within the area of their paranoia, they are generally normal enough in other aspects of life --- except, as you describe, that a tendency to become a loner, due to the suspicions. Sometimes they can be persuaded to see a tactful ( and pre-informed about the situation ) psychiatrist in order to get help with dealing with the impact the persecuation is having on them, without directly challenging their beliefs, about which they are generalyl firmly fixed.
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