If someone has a seiser n few days after he's having blackouts, as in he's not remembering doing things, how he got places.. what's wrong with him?

Caused by alcohol?: If this person had blackouts, i assume from heavy alcohol use, he/she can also have a alcohol withdrawal seizure. After any seizure there can be a period of confusion. If heavy use of alcohol is involved, then he/she needs to be detoxed with the help of a professional or in a rehabilitation program. If there is no alcohol abuse then a consultation with a doctor is warranted.