My father’s age is 69. He took the 2nd dose of covishield vaccine a week before. Since then he is getting continuous headache, fever, body pain. And since last 2 days spo2 level is also dropping to 92. After doing breathing exercises oxy level improved to 95-96. But in morning his bp drops to 112/70 with pulse rate dropping to 43-45. please advise.

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