Claire and Lola's brains were completely fucked from the beginning, but every seizure a person has causes microscopic changes in the appearance of the brain tissue and increases the risk of having another. Seizures can cause physical injuries, like severe bite wounds on the tongue or inside the mouth, injury from falling or banging the head, and broken bones, which would be an especially relevant concern in children like Claire and Lola, who undoubtedly had shitty bone density. Poorly controlled seizures can quickly spiral from a single event into a long, continuous seizure, or
status epilepticus, which can and does kill people even with medical attention. Uncontrolled epilepsy also dramatically increases the risk of
SUDEP, or Sudden Unexpected Death in Epilepsy Patients, which is pretty much the greatest fear of every caregiver of someone with epilepsy. All of that aside, anyone with epilepsy can tell you
recovering from seizures fucking sucks even if your brain isn't totally gorked. You feel sleepy and confused, may have a bad headache or nausea, and just generally feel not like yourself. If you only have one or two seizures a year, maybe it doesn't hugely detract from your quality of life. Kids like Claire and Lola, though, have
hundreds to thousands of small seizures every day. Without effective medication, they're constantly either seizing or postictal, and if they were capable of feeling anything, they probably felt like shit 24/7. I also really don't understand how a parent would be able to stand watching her kids have uncontrolled seizures without at least trying available anticonvulsants. I know Gwen claims that Claire and Lola were "too sensitive" for any medication other than acetaminophen/paracetamol, but that absolutely reeks of cope and I never believed it. That was the same justification she gave for why Lola didn't have a feeding tube, which is another decision I found pretty heinous.