A character of mine has seizures so I've done quite a lot of research regarding the disorder. I found this video on YouTube about a year ago and found it rather helpful. The video is nearly 15 minutes long, but you can see first-hand how one behaves before a seizure, during, and after.
http://www.youtube.com/watch?v=DuMTx95Wps0
I found this online also. It's a list of symptoms commonly experienced by epileptics or those with seizure disorders.
Visual changes
* Bright lights and blobs
* Zigzag lines
* Distortions in the size or shape of objects
* Vibrating visual field
* Scintillating scotoma
o Shimmering, pulsating patches, often curved
o Tunnel vision
* Scotoma
o Blind or dark spots in the field of vision
o Curtain-like effect over one eye
o Slowly spreading spots
* Kaleidoscope effects on visual field
* Total temporary monocular (in one eye) blindness (in retinal migraine)
* Heightened sensitivity to light
Auditory changes
* Hearing voices or sounds that do not exist: true auditory hallucinations
* Modification of voices or sounds in the environment: buzzing, tremolo, amplitude modulation or other modulations
* Heightened sensitivity to hearing
* Someone speaking at a level and normal tone sounds like they are shouting loudly
Other sensations
* Strange smells (Phantosmia) or tastes (Gustatory hallucinations), or where food and drinks taste differently than usual
* Heightened sensitivity to smell
* Feelings of déjà vu or confusion
* Feelings of numbness or tingling on one side of the face or body
* Feeling separated from one's body
* Feeling as if the limbs are moving independently from the body
* Feeling as if one or multiple limbs are growing
* Feeling as if the mouth is too small for the teeth inside
* Feeling as if one has to eat or go to the bathroom
* Feeling as if one is going to vomit
* Anxiety or fear
* Weakness, unsteadiness
* Saliva collecting in the mouth
* Being unable to understand or comprehend spoken words during and after the aura
* Being unable to speak properly, such as slurred speech or gibberish, despite the brain grasping what the person is trying to verbalize (aphasia)
* Temporary amnesia, such as forgetting how to do tasks you have been doing for years
Early seizure symptoms (warnings)
Sensory/Thought:
Deja vu
Jamais vu
Smell
Sound
Taste
Visual loss or blurring
Racing thoughts
Stomach feelings
Strange feelings
Tingling feeling
Emotional:
Fear/Panic
Pleasant feeling
Physical:
Dizziness
Headache
Lightheadedness
Nausea
Numbness
Seizure symptoms (no warning)
Sensory/Thought:
Black out
Confusion
Deafness/Sounds
Electric Shock Feeling
Loss of consciousness
Smell
Spacing out
Out of body experience
Visual loss or blurring
Emotional:
Fear/Panic
Physical:
Chewing movements
Convulsion
Difficulty talking
Drooling
Eyelid fluttering
Eyes rolling up
Falling down
Foot stomping
Hand waving
Inability to move
Incontinence
Lip smacking
Making sounds
Shaking
Staring
Stiffening
Swallowing
Sweating
Teeth clenching/grinding
Tongue biting
Tremors
Twitching movements
Breathing difficulty
Heart racing
After-seizure symptoms (post-ictal)
Thought:
Memory loss
Writing difficulty
Emotional:
Confusion
Depression and sadness
Fear
Frustration
Shame/Embarrassment
Physical:
Bruising
Difficulty talking
Injuries
Sleeping
Exhaustion
Headache
Nausea
Pain
Thirst
Weakness
Urge to urinate/defecate
In my research, I visited Epilepsy forums and one person had said after a seizure--though they were right-handed--they continued to use their left hand in writing and other tasks. Someone had said before a seizure they felt like they were 'falling through the sky'. Definitely look through forums. Everyone experiences seizures differently because the injury or complication that causes them differs from person-to-person. The man in the YT video started having them after a brain hemorrhage, but then some people have them due to autism.
What time/setting is the story in because the superstitions of people from a couple hundred years ago is interesting. George Washington's daughter had epilepsy. (It wasn't really
his daughter, but Martha's from a previous marriage) But
their daughter was given a ring that they thought would cure her seizures, however, she died after a major fit. One thing I discovered too is the term 'epilepsy' and 'seizure' weren't commonly used by the public until--if I recall the 1800s, but don't quote me. The public called seizures 'fits' for a long while.
Some interesting reading:
http://brain.oxfordjournals.org/content/125/2/441.full