In 4 months my husband has went from speaking, following instrutions, trying to help, going out,eating himself and not incontinent. To unable to communicate, follow instuctions, go out,or eat himself and challenging behaviour. This has also happened after seizures. He is now also jerking and they are having problems controlling him. Is this common with younger sufferers to go down so quickly? How many have had myoclonics and seizures causing a rapid deterioration? He was only diagnoised 2 years ago as well. He is now 54yrs old.