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Thanks guys, my parents are as worried as I am, if not more - he was searching their attic for bugs the other day... Getting him to the doctor is going to be nigh on impossible - as far as he is concerned, all that he believes is true.... and the doc would be in on the conspiracy...
He did have a similar episode a few years ago, but it seemed to disappear of its own accord - I just fear so much for his welfare, and that of those around him.. I find it so frustrating to talk to him, because he won't see 'sense'! Has anyone else experienced anything like this?