You're going to have to do some tests to check your body's response to your medication, to test your blood test, your whole blood count, your kidney function, your urine test, your IV fluid replacement, your electrolytes panel, your glucose levels, and so on.
Doctor, after taking analgesics because of your headache, your body hurts, and it's like you've eaten too much, and you don't feel good, and your stomach hurts.