So sorry to hear about your loss. You and DH will be going through a really painful and difficult time and often during this it’s easier to keep doing what you always did, there’s comfort in familiar things.
Having been a full time carer for my husband for a number of years until his passing I can fully understand and empathise with the situation you find yourselves in. It feels like you have forgotten what else you can do and you find yourself in the rut of your routine, but at the same time there is a huge gap in that as your loved one isn’t there. It’s small steps at first and reminding yourself it’s ok to do different things now and not feel guilty about doing the things you couldn’t with your DC.
Things I found helped :
Booking to go to the theatre or cinema once a month - something in the diary to look forward to. I set myself the goal of making sure I always had a least one event in the calendar.
Visit the beach and go for a walk / coffee
Take your book and sit in the coffee shop for an hour or two ( different environment to home)
Visit the local NT properties / local gardens
Sit in the local park with a coffee and your book - enjoy people watching for a bit
Check out the local museums and visit any special events
Reach out to one of your old friends for coffee
Think about doing some study with the OU / local college to learn a new skill or subject - provides some structure and a different routine.
I liked swimming so started going once a week and set myself targets to improve my number of lengths / time to complete
Book a weekend away - enjoy the spontaneity of being able to just throw your bag into the car without having to plan a military campaign. It’s ok - give yourself permission ( or if that’s difficult I give you and your DH permission to go and enjoy the break ) Plan 2 or 3 so you have them in the diary to look forward to.
Find a local group with similar interests to yourself and join ( book club / art / wine tasting / music , whatever …. )
It will take time as you have to rewire your brain and thought processes to think about the things you can do and lose the “can’t do because…….” tag and accept some days you just don’t want to do anything, just be quiet with your thoughts , memories and grief - that’s ok too. Full on caring has been a huge part of your life and you have to transition at your own pace.
Don’t push yourself too hard, be gentle and kind with yourself and DH - it will happen and you will find a new life rhythm.