Karl
i would most certainly follow-up with your dentist.
The antibiotics will reduce the infection, which is good, but there is no substitute for either removing the offending tooth or the dentist starting a series of endo treatments on the tooth.
Whilst many people prefer to avoid the dentists office the consequence is increased discomfort each time the tooth flares up.
Your headaches will continue until the tooth radiating the pain is delt with.
Mike