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Writing in her new book, The Power of Hope, Kate explained she had pressed Derek's doctor about when they might 'know more' about his recovery.
"I had already waited so long. 'How long before you know more? Not how long will it take for him to recover, because you don't know if he can recover, but how long before you might know more?'" She wrote.
"It was a confusing question, but I knew what I meant and he seemed to as well.
"After a long pause, he looked straight at me, then away. 'Well, Kate' - the first time he had used my name - 'I think it's fair to say if he is still like this after two years we will know there is very little chance of him making any meaningful recovery.
"'TWO YEARS!' I screamed inside my head."
Derek returned home back in April, after a year in hospital.
The former political advisor was admitted into hospital with Covid-19 last March, before being placed in a coma. The disease left him with kidney failure, damage to his liver and pancreas, as well as heart failure.
In her book, Kate goes on to explain how doctors have warned her Derek's recovery will not be quick, explaining he has moved from the 'acute' to 'chronic' phase.
"Even if he can live, and begin to recover from the huge damage Covid has wreaked throughout his body, it's not going to be quick," the doctors had said.
"Up until now I had been living by the minute, hours on the phone monitoring infection levels and statistics, trying to get a handle on where Derek was, wondering every time I went to sleep if he would still be alive in the morning," Kate added.
"How could I go on like this for another two years? Worse still, how could Derek be trapped like this for two years? The timescale winded me and I'm sure I must have slumped a bit in the chair."
Kate's book, The Power of Hope is out now.
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