I think you're missing the point. I think the reason he said that "'normal’ life for me will probably never be the same" is because doctors have told him what he can expect.
https://www.theguardian.com/world/20...soned-novichokBefore former spy Sergei Skripal and his daughter Yulia collapsed on a park bench in Salisbury on 4 March, the only other person confirmed to suffer the effects of novichok was a young Soviet chemical weapons scientist.
“Circles appeared before my eyes: red and orange. A ringing in my ears, I caught my breath. And a sense of fear: like something was about to happen,” Andrei Zheleznyakov told the now-defunct newspaper Novoye Vremya, describing the 1987 weapons lab incident that exposed him to a nerve agent that would eventually kill him. “I sat down on a chair and told the guys: ‘It’s got me.’”
By 1992, when the interview was published, the nerve agent had gutted Zheleznyakov’s central nervous system. Less than a year later he was dead, after battling cirrhosis, toxic hepatitis, nerve damage and epilepsy.