No cold sores, here, but I get canker sores with a certain dreadful irregularity.
Things that aggravate/hasten the onset of canker sores:
lack of sleep
salt
Things that seem to alleviate canker sores
sleep
Vitamin C (orange juice, etc.)
Lactinex® (an OTC drug usually found near the pharmacist’s counter rather than with the cold sore medicine; sometimes kept behind the counter although you do not need a prescription)
Tom~