north central Iowa, Hampton | can't help on the stomach issues, but canker sores or cold sores are easily stress related and the they hurt. I've had good response from taking a thousand mg of L- Lysine in tablet form 2-3 times per day just as soon as I feel the tension, itch, burning or whatever symptoms you notice, of a sore coming on.
Sometimes prevents the blistering, always speeds the healing process.
good luck
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