It's physically impossible to swallow your tongue. In fact, you should never force something into the mouth of someone having a seizure. That's a good way to chip teeth, puncture gums, or even break someone's jaw. People with seizure disorders are found in all walks of life and at all levels of business, government, the arts, and the professions. It is a functional, physical problem, not a mental one.
Epilepsy is a chronic medical problem that for many people can be successfully treated.
Unfortunately, treatment doesn't work for everyone and there's a critical need for more research. In the vast majority of cases, epilepsy should not be a barrier to a normal, productive life. It is too often people's misconceptions about epilepsy which create the disability, not epilepsy itself.