Shana Pezaro, 33, who has MS has told Daybreak that the lower levels will be badly affected by the cuts.
She said: "They are cutting the lower levels - so people who may not have as a high need as I do - for instance, I have a friend with MS, who gets £20 per week.
"With that money she can pay for a cleaner to come in for an hour and it also means that she can get a cab back from work for two of those three days when she's working._
"That money is an absolute essential life-line to mean that she can stay in her job. Now you take that money away and suddenly she is stuck in terms of being able to do her job."
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The man, who was in his 30s, has not been identified, while several other people are believed to have suffered serious injuries.
The Olympian was one of several sports stars who opened up to the prince during an event for his mental health charity Heads Together.
There will be sunny spells, with temperatures peaking at 23 Celsius (73F). However, Northern Ireland will experience frequent showers.