I use tylenol (acetaminophen) a few days a week during summer for headaches and took 650mg today. is it ok to drink tommorow?

Depends how much: If you only used 650 mg each day for 3-4 days & then another 650 mg today you are o.k. for a couple of alcoholic drinks. Better not to drink, it has it's own health problems. If you take Tylenol (acetaminophen) even at 650 mg you may get a medication HA and then need it everyday, so be careful. Have your HA checked by a doctor.