I'm sure JV was completely freaking out at the hospital - he knows what he did to Preston, that he will found out and that his life will never be the same again - he was upset for himself, but JMF actually seemed to feel more shock and grief for Preston, JV didn't even want to go to him or hold his hand when he was dying.V seems to think his fake wailing will fool the hospital into not alerting the authorities. He is used to getting attention and sympathy when he goes all dramatic and it worked up to this point, classic DARVO moves.
JV was waffling on about getting his pjs and his pj top but he was vague or 'no comment ' at other times - he was focussing on an irrelevant detail to avoid saying what he actually did to Preston.
@PaddyDomino made an interesting comment about killers mentioning baths and showers, I'd not picked up on this before but a few cases come to mind - psychologically, I guess it is a killer 'cleansing' themselves and 'washing away' their guilt