Cure for Mouth Ulcers: Eat more vitamin B.
I used to suffer from loads of them but eating liver once a week or Vitamin B supplements fixed that.
Cure for IBS (Irritable Bowel Syndrome), diarrhea or bloating: You are allergic to something.
Send a hair to these guys http://www.healthsynergy.co.uk/ and they will tell you what it is. It cost around £50 but it's worth it and works from my experience.
Children are hyper and won't behave: They are allergic to food colouring and preservatives.
But natural forms of these can be found in Strawberries, raspberries, bananas and peas.