I'm experiencing a contant feeling of fullness and occasional spasms inside the right side of my head. followed by dizziness and confusion. seizures?

Head aches: What you are describing may be due to a vestibular pathology or migraines. I recommend consulting a neurologist to determine the source of your symptoms and plan your treatment.

Possible: Unless you are having absence petit mal seizures most people will have the grand mal type where you are shaking violently. Even with absence seizures patients will lose consciousness momentarily , be a bit dazed and seem to stare out into space or daydream. Best to see your physician or go to the emergency room for full assessment.

See a neurologist: These symptoms may represent a headache, seizure, or other neurological condition. You should keep a log of the location, timing, duration, and intensity of these episodes and take the log with you to a neurologist. http://www.epilepsy.com/article/2014/3/seizures-and-headaches-they-dont-have-go-together , http://www.medscape.com/viewarticle/581669_5