In my opinion,althought only one difficult thing in this sentence,Chinese like to feel pity about that not only he got sick, "but" feel pity that he cannot talk easily... "but" in here is same as "都". ..Strictly speaking, the concept of "都“ you think is right,chinese just like to talk with more emotions (like,pity,shock...）it's make it more like oral language. (i am not prefect at English,hope u can understand)