I often take painkillers (acetaminophen aka paracetamol), but I’ve noticed that it’s much more effective if I take them TOGETHER with my ADHD medication (ritalin aka methylphenidate) + my morning coffee. If I don’t take them AT the same time, the painkiller is far less effective.
I do not exceed the maximum dosage of painkiller (1gram per intake, mornings), but alone this would barely suffice to kill my morning headache.
My hypothesis is that since the LIVER has to convert all three, I am effectively overdosing on either substance (painkiller or ADHD meds), and damaging my liver in the process.
Another hypothesis is bruxism (teeth grinding). Some people have it during the day, others (like me) have it during sleep. Stress and anxiety makes it worse. I only discovered I had it because people heard me biting my teeth against each other while asleep. I went to a dentist, she made me a mouth guard that I use every night before going to sleep, and the morning headaches stopped since then.