My son has anxieties - every since he was born ... imagine the worst separation anxiety you can imagine ... it was worse ;-) - now he is 9 and still worries - about many many things ...
He also suffers from stomach aches which are part of his Migraines. When he was little he only had the stomach aches - inexplainable horrible pains ... around age 8-9 he had the first headaches.
I have migraines my dad had migraines - all my siblings get them so I am not surprised but a lot of people have never heard about " intestinal migraines" so it is sometimes a bit hard to explain to a school ...
There are some awesome resources regarding anxieties online but I would strongly recommend getting a referral from your pediatrician to a good child psychologist. Anxieties are very treatable - and chances are that they will not go away on their own.
I think we are making some progress with our son - he can now recognize anxiety and he is starting to learn coping mechanisms. We have described Anxiety to him as his " worry glasses" that he needs to take them off to see a situation with his " real eyes" - we always talk about situations and assign percentages " how likely is it that your principal will expel you because you lost your paper" or " how often do you think tornadoes hit in this area"? Is this a realistic fear or do you have your worry glasses on ... it helps ..
According to our TAG teacher many high functioning kids suffer from anxiety ... you are not alone !