Derek, 53, remains in hospital after being admitted with coronavirus symptoms in March last year, before being placed in a coma.
TV host Kate, also 53, suggested they would have a ‘completely different dynamic’ in their marriage when he is able to leave the hospital.
She tells their son Bill: ‘You know that we are hoping that dad will get better and better, but when he comes home he will probably need to be in a wheelchair, so we are trying to make it so he can do all this.
‘And if I have to give up work to care for him then it is best to do it now when I am earning money.
Kate Garraway’s husband has been in hospital with Covid-19 for a year (Picture: Rex)
‘If he needs 24-hour care I will be the primary carer. I have a fear of the reality of that life. It is a completely different dynamic to our relationship.’
Kate says Derek’s gradual recovery, which has seen him regain the ability to talk, ‘feels like a positive’.
She adds: ‘The only thing that panics me is that we are on such a rollercoaster with Derek that I am looking around during all this chaos and then the next minute there will be a phone call to say something has gone backwards.
Derek told Kate that he ‘just can’t go on’ in a devastating phone call (Picture: ITV)
‘You think, “Gosh am I just fooling myself, I suppose?”‘
The documentary details their family’s experience during his illness and sees Garraway speaking to people suffering long Covid, NHS staff and other experts.
One scene sees her recall being told by Draper’s doctors that he was the most seriously ill person they had seen who remained alive.
‘Derek is the sickest person the team of doctors in the lung hospital has treated that has lived,’ she said.
Kate fears the reality of being Derek’s primary carer (Picture: Rex)
‘His kidneys have failed, his liver has failed, his heart is being supported with medicine.
‘So the best way of coping with that is to think, “What have I got control over?” and I guess that is making sure the children feel okay.’
Elsewhere in the programme, Sir Elton John supports Kate over the phone, telling her: ‘I pray for him every night, in my prayers, and you and your family.
‘He is an amazing man, please give him my love when you talk to him next time.’
Kate has been playing Derek music by Sir Elton in a bid to trigger emotional reactions.
Kate Garraway Finding Derek airs on Tuesday at 9pm on ITV.