So sorry to hear of your diagnosis. It's great you're managing at the moment. As others have said, I would claim it to allow you to get some help to make things easier for your DH and allow him to spend more time with you rather than doing household/garden tasks.
probably also easier to do the paperwork while you're managing quite well rather than put it off and find you can't face the thought of it if you're not feeling so well at a later date.
Employing a cleaner/gardener/handyman or whatever will also be helping others in your area in these difficult times.
If you feel, after a while, that you could have managed these extra things anyway financially, you can always make a donation to charity.
Static caravan purchase is it worth buying
Our Welfare State. Is it broken?