Excellent advice here. I also developed a spinal condition in my late 30s; it causes me to trip/fall quite a lot, and I can be a bit unsteady. It's shit, I get it. But, I live alone, and have had to make adaptations to my flat - I use the non-spill thermos mugs, and carry things around in a bag (where possible), so I have both hands free. I fell yesterday, and broke a glass picture frame, so had to clear up glass/a cut hand with glass in it. It's life.
I'd second that if your husband is so bad that you need to be there with him, it might be time to have a discussion about what help he needs through the care system. Otherwise, he needs to use adaptations in the house, and not do anything he struggles with, when he is alone.
Oh, and the email thing..... it's Monday morning. I would imagine they picked your email up when they logged in at 8/8.30(?), and were busy sorting cover, before they check in with you; and when they do check in, they will be keen to know how long you'll be off, given the knock on effect.
I hope all is ok.