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thanks everyone. He's useless at the gp, so hasn't asked what the readings have been. An infection is more than likely - he's a carpenter so constantly covered in cuts.
Is it possible that some or all of his symptoms are being caused by nicotine? When i said he's being trying to quit i mean that he started using patches, has painful reactions to every brand he's tried, so after a week or so he gets disheartened and smokes for a day or two, then either goes back to patches or goes 'cold turkey'. Could this be causing problems (other than mood swings!)?