Could be serious: If he uses much alcohol or drugs but not as much recently, it could be withdrawal (which would be put off ---delayed---by drinking or using again) but it could also be other, even more serious things. He should take his temperature and you should be sure he gets seen by a clinician. No one has these symptoms unless something is seriously wrong. Good luck.
Answered 9/11/2016
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4 doctors weighed in across 2 answers
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2 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
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