Missing final exam due to exhaustion? A student is asking for an alternative exam because he was "completely exhausted" due to overwork the last month or so of the semester, including the exam day.

He provided a doctor's notice validating the claim and explaining the physical symptoms. He also provided another notice proving he did actually took an excessive number of courses recently and did well.

Should I give him the opportunity to retake the exam?
You should do whatever you or your institution would ordinarily do for a student who brought a doctor's note after missing an exam. You are not the student's doctor and the cause of the student's illness is completely irrelevant.